Is the pain like tenesmus, also, minnietoty? I find that taking warm baths, using hydrocortisone cream/suppositories help with the spasms and inflammation! On those days where I just can't take it and I feel like I have to 'D' but it wont come out I use the hydrocortisone cream and use a 'butt paste' after appling that and I usually have a BM fairly soon. I take the cortisone suppository 2 times a day because the Canasa ones haven't been cutting it. My GI suggests when the inflammation is bad an I'm 'constipated' (tenesmus) to just take a half dose of miralax and go on with the usual med routine and that helps a lot!
When all else fails I take tylenol and maybe a lortab...I'm not big on pain medication but ya gotta do what ya gotta do sometimes. Tylenol does nothing for me though when everything is swollen shut..
Hope the pain/inflammation subsides and you can get in touch with your GI asap! Happy holidays