Feeling Stuck Due to Health Limitations

I feel like I'm not living up to my full potential. My health holds me back. Migraines cause me to miss work, my chronic fatigue makes me take micronaps and not concentrate well. I always felt that if I had no health problems, I could achieve so much. It's a terrible feeling, and I don't know how to shake it. Other people just tell me to go for my dreams and don't give up, but if they had the limitations I do... For or instance, you can't be a pharmacist if you call out all the time, or you are too tired too concentrate when accuracy is key. I was actually accepted into a doctorate program to become a pharmacist, and I had to back out. It felt like s***