if this is possible, its probobly at Area 51. Do you know how many service professionals working with microwave transmitters and how many malfunctioning microwave ovens there are in the world? If this was a problem it would be well documented by now. You cannot do this with any standard equipment and its unlikely it can be done at all.
If anything the regulations were tightened recently. Back in the 50's people in the Navy and Airforce would be exposed to all sorts of insane RF levels without feeling these symptoms, particularly on ships that hold thousands of people. It is most likely your imagination. If this was at all possible there would be millions of exposures from RF energy centered around shipyards and airports. I.e. what if a fighter jet anti missile EW system turned on an aircraft carrier by accident? nothing, and those are where the real dangerous transmitters are. There are entire books written about managing excessive electromagnetic field levels inside of ships filled with people, I have seen them. Its all about protecting the computers, the people are not effected unless they feel fire.
And there are likely thousands of irresponsible HAM radio operators that mess with unsafe power levels and do not follow the law or recommendations on a regular basis without these symptoms. Plus TV and Radio stations.
Yea work in engineering for a few years you will see every safety regulation violated eventually. It happens. Its not some mystery as to what happens when there is a high RF power level around.
There is a story here of Russian soldiers adjusting a missile tracking antenna with a floor mop because the tracking system broke, so they can launch some kind of space rocket. The RF power levels were so big the doctor said they can take 2 minutes max before their bone joints start being effected. Other then the effects of medical microwave heater (a well known process where you heat the body with RF energy for medical reasons with a diathermy generator) there were no known psychological symptoms, even in this extreme situation. You just cannot do this with RF, at least with the RF that most people here know (say to 25GHz).
The only system in existence that can do this would be a military grade area denial system, and the symptom would be burning (like intense light, a heat lamp). These have a hard time fitting on the back of a humvee and cost millions of dollars and if one of those goes missing there will be like 5000 men in black investigating, be in the front page news (and the only reason it would go missing is so that it may be sold to the Russian or Chinese military, not to troll someone). Also if someone tried to operate this in an apartment building it would likely fuck up the entire building system, fry peoples electronics, turn the room they are shooting it from into a microwave oven. I read a post once about how in Russia once a radar transmitter misaligned and pointed into an apartment building. It caused light bulbs to explode, electronics to fry, basically a huge commotion, it will not go unnoticed. And it would not be focusable on a body part through a wall, maybe if you were in the middle of the desert with one of these systems they could get half of your body. The 'focus' these microwave systems have is akin to a light bulb inside of a garbage can. Its not like a broadway spot light, you cannot really do that.
Now, I do recommend getting a microwave power meter, if you do not have the courage to see a doctor, only to reassure you that you are
1) not in danger from microwave or radio energy
2) likely need some sort of medical treatment, probobly starting from a stress reduction therapy, sedatives and counseling
Your stomach is effected by serotonin receptors by the way. This can be specifically effected by an anxiety disorder (similar to how people in extreme mental situations can vomit).
Also, waiting for something to ship and to attempt to do RF measurements and try to learn physics in your mind set will be very difficult and most likely counterproductive. Now this is the machine you are imagining,
https://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/An_operational_version_of_the_Active_Denial_System.jpg/440px-An_operational_version_of_the_Active_Denial_System.jpgwhat would happen is it would
1) blow the circuit breakers
2) trash the building electrical, destroy your neighbors stuff, break your pc
3) fall through the floor and kill the operator
4) the cell phone company would be out in force with the police department if one of these operated for 3 seconds in a metropolitan area, it would possibly cause a blackout and destroy millions of dollars of electronics, electronically its like turning a light saber on inside of a box of waffles