Severe rectal pain during a bm

For the last 3 months, I started to suffer from C. Having a bm every 4 or 5 days has become a blessing as I could stay for 8 days w/o a single bm. Today, at work I couldn't sit at all as there was severe stabbing pain in rectum accompanied by nausea. I prefered standing than sitting and the pain was pressing against my colon and that in turn was pushing my stomach and will increase nausea and headache, in turn.
When I went home, I needed to use the bathroom urgently but couldn't. Inserted a glycerin suppository and here came the torture. I kept straining and screaming and didn't know what to do. I was squeezing my bowels but very minimal came out. When I left the bathroom, I found my sisters and nephew gathering shocked about my screams.
Had another urge and rushed to the toilet. Could hardly stop screaming but this time what came out were a few drops of blood. I'm typing after 2 hrs of the last bm and still I can't sit and I'm lying on my side.
This is not the normal anal fissure pain I'm used to. Could this be a proctitis flare up? Can't tell. I have a history of proctitis and rectal narrowing. The last colorectal surgeon I saw said he won't prescribe rectal meds as I do take a lot of systemic oral meds. New symptoms every now and then and I feel I'm at a loss.

Ides, thank you so much. I experienced fecal impaction before. Then, I saw a colorectal surgeon and he gave me a syrup for 4 doses and said if things didn't start moving, I had to call him and he would manage. Thanks God, then, the med made me have bms.
Take care :)