So frustrated

My question is:  I was diagnosed with stage 3b Colon Cancer last June, I had surgery and chemo, which ended this January.

I have had serious bouts of diarrhea for the last 3months, which they finally diagnosed as IBS.  I also began getting acid reflux and stomach nausea when I eat.  My Doctor prescribed Prilosec and a Probiotic,which seems to be helping some.  Around the same time this began, I began experiencing extreme pain in my bones and muscles.  I wake up in the morning some days can hardly move my hands. It seems like I am retaining large amount of fluid in my hands.  I can hardly walk down the stairs, since my muscles don't seem to want to work.  My bones and muscles ache, coupled with the diarrhea, it feels like I have had the flu for months.  I am getting so frustrated, I want to cry.  

My Doctor has run numerous tests and below is what has come back low. (My Doctor says it is normal except for the vitamin D, which she has now put me on a prescription strenghth vitamin D supplement)

Vitamin D total =19.9
Sedimentation Rate =22
Bun =6
CO2 Total =21

All the other test have come back in the normal range