Struggling with Malnourishment and Fibromyalgia

I’m not sure what to do. I’m eating as much as I physically can orally (it’s still not nearly enough), I’m continuing to lose weight (I’m currently 5’4” and 98 pounds). I lost 13 pounds these past 4 weeks. I need to get my nutrition back on track, I’m so malnourished and fatigued and my fibro has been AWFUL probably because my body is under so much stress. Im not sure I can do tube feeds bc I have a condition called Interstitial cystitis so I have to be extremely careful about what I put into my body because it could potentially cause severe bladder pain (which is so bad it’s unbearable - so bad I’ll be writhing around crying and screaming). I feel so stuck and my doctors aren’t really doing anything for me. UGH. Any advice or insight? :(