Any thoughts??

I’m 18 weeks and 5 days today. Friday night/early Saturday morning I woke up with extreme right upper sided back pain. I’ve had back pain for several years but it’s much lower where I had an injury like L4-L5 and when bothering is worse with movement. This pain woke me up from a dead sleep. I thought maybe I strained it at work on Friday. So it hurt all day Saturday and I finally took some Tylenol, laid on a heating pad and got relief. Same thing happened Sunday while sleeping. I’ve not had any nausea with my pregnancy since thanksgiving but my stomach does feel a little queazy and I think my appetite is decreased. Last night after I ate a quesadilla and fruit from home I had really bad diarrhea 🙈. I’ve eaten both of these though out my whole pregnant and never any problems