Anyone know what could be wrong?

Firstly I would like to say to do this whole COVID situation I can’t see a doctor so I’m just wondering if anyone knows what this could be. So recently I have had a huge loss of appetite and have lost weight due to it, I have also been feeling very nauseous recently (haven’t been sick tho) then about a week ago I started getting this pain in both sides of the middle of my back (normally not both sides at once). Normally the feeling sick comes with the back pain. As well I have been getting pains in my stomach that feel like the mix between a stitch and a cramp but I don’t get this as often as my back pain. I am not due on my period as I only had on not long ago and have been on the pill for like a year. If anyone has any idea what this could be please let me know x

Edit: the pain in my stomach is like next to my hip/pelvic bones like in between the bones and my stomach(it’s hard to explain) on both sides, a lot of people are saying it’s a kidney issue. Does the location of the stomach pain back this up? And I haven’t noticed any issues with my urine, however I will look out for any issues