Prozac

I’ve been taking prozac (fluoxetine) on a fairly low dose for around 3 months. At first I was fine then started to struggle with side effects I got a viral infection and became really ill, thinking it was glandular fever I had tests done but everything came back clear. I was so exhausted I couldn’t do anything. That was around a month in and when I was better I felt the best I had in years but now I’ve gone back to college I have the same feeling again. I’ve had an on going cough, cold and just feeling tired for nearly 3 weeks. Has anyone else experienced this? Anything is helpful xxx