How do I take control of my stress and prevent my body from showing it?

I’m a junior in college and am under stress (obviously, who isn’t). For the past 3 years I’ve been pretty good about managing my stress and am naturally a very healthy person. I get sick less than once a year and when I do I’m usually healthy in 3 days.

That being said lately I’ve been getting sick a lot, but with a twist. A few weeks ago I had what seemed like allergies and went away instantly when I went home for the weekend.

This past week I started feeling the same way and just ruled it out as the allergies coming back. Our school has had a possible flu outbreak and started sending anyone home with a fever over 100 degrees and a cough. Yesterday morning I walked into health services with a cough, runny nose, body aches, headache, sore throat, and a fever of 102. I collapsed trying to follow the nurse into the room. I spent all day sleeping and feeling like dealth but decided at 4 pm (I was there since 9 am) that I could attempt to drive home, my fever at this point was 99.7. I’m not lying when I say after I passed the first state line every single symptom was gone. A day later I do have a slight cough but nothing compared to what I was.

My roommate has mentioned that maybe stress is causing me to be sick. It does make a lot of sense considering I feel completely better as soon as I’m home, and I learned once that strong emotions on the inside can manifest into physical ailments. I used to exercise a lot but have had a hard time this year trying to find time for the gym, and I know this is probably one of the reasons I’m going through this now. What else can I do to cope with my stress and stay healthy? I feel stressed but not enough to keep getting sick over it. Along with being sick I’m constantly tired, have trouble paying attention, and am easily distracted. I can’t keep letting my body show my stress, I need advise.