I have had a pain in my lower left quadrant of my stomach?

I am female 47. Have had hysterectomy. I have RR MS. I have had a pain in my lower left quadrant of my stomach. It started about 6-9 months ago. It never really bothered me too much before. I have so many weird unexplained pain due to my MS I ignore most things and they go away. This one is different. It is getting worse. It wakes me up at night. I feel it all the time now. I do have IBS. I know the differences with a flare up or being constipated. I exercise and am 5’6″ and 135 lbs. I don’t smoke and don’t drink alcohol. My GP put in for me to see gastro for a colonoscopy but it will be forever before i see one. What should I do?