Strange feeling left side colon

Hello all,

For the past 2 months I have been suffering digestive issues, mainly constipation, slow transit time and indigestion. At this moment I have no Idea why these things are happening. I have been to a specialist and she did my thyroid tests and they came out normal.

From What I have read on the internet, it is possible that I may have Gut Bacteria Imbalance (Dysbiosis) or Candidiasis( Yeast growth) in the colon. But again these are all guesses and I am not sure. These things began about 2 months ago with a upset stomach/diarrhea that lasted about a week, then a week after I became completely constipated and all these issues began.

Anyways my current question is about a strange feeling in my sigmoid and decending colons, this feeling has been there since the last 2 months when all this began. It basically feels like I have something in side my left side colon. Also I can even feel the Stool in there, because it seems to get stuck when ever it is passing from that area. What could this be? I have no pain at all, it's a just a strange feeling. Could it be a blockage or even some thing else?

I plan to do colonoscopy next month, but I hope I could get some answers before that