How can I avoid feeling trapped and depressed when I am sick, or when I have an ailment?

For example, right now I'm not sick, I have supposedly a small bacteria infection and so I'm taking ciprofloxacin, a pretty strong antibiotic where some people have described devastating side effects. Luckily I don't believe I'm suffering many side effects, except the feeling of just being in a complete mental prison. One of the potential but rare side effects could be tendon rupturing, especially the achilles tendon. I'm an athlete and I use physical exercise as a means to feel okay mentally.

Still I have been exercising, just lighter. But I cannot get over the feeling of that everything feels like shit right now. Just like when I'm sick, even with a cold, if I'm not fully well, I feel horrible. Like if something is a little wrong or mildly wrong, everything is very wrong. Like I'm an addict to feeling healthy and 100% or I feel horrible; like my body is being attacked, at this moment my tendons are weakening, my gut bacteria are being destroyed, etc.

Just wondering, is this normal? I'd love to feel peace currently but I don't feel joy nor peace. It feels like my body is being attacked/damaged (again, this is probably very mental too). Do you guys experience this also? Any advice on feeling/being okay, well joyful, despite taking antibiotics or being sick? Or is this just normal?