Normal but sucks
Listen to Aboot. I make homebrew. I inject test prop five days a week and test enan 2 days a week along with other compounds I'm not listing in this thread. I currently have test flu and have had it about two weeks. Injections from both prop and enan are swollen and hurt like a MF!
Like Aboot said, mixing esters and fluctuating levels of test can do this. If you observe, the more your injections start to swell and hurt, the more flu-like symptoms you will get. I take lots of ibuprophen and tylenol.
I don't understand the idea of BA making you sick. I don't know if this is documented or just an idea that got started. I would like to see some evidense of this. I'm not discounting it as untrue I just don't understand why it would give you flu-like symptons. Its just alcohol with an ester.
I am only going to be able to handle a couple more days of prop and then i'm done for a while. I will still continue to use test enan and other compounds for the duration of my cycle. I got what I wanted out of the test prop but now this flu just isn't worth it any more. I will use prop in the future( I have enough for a whole football team) but it will be for specific times and specific durations.
Also, if you are adding prop in your cycle to get more cut, it probably won't work. If anything it adds mass quicker. Thats why i periodically use it in my cycle to boost gains for about four weeks.
I also learn to cut my injections up two or three smaller injections in different areas, less swelling, less pain, less flu.
Anyway, you are not alone! Decide if the sides are worth the gains.