is this IBS??

for a few months now i've had a condition whereby i get bloated, constipated etc and it's painful, i also get a taste in my mouth which immediately tells me that i'm going to experience this and i've noticed that tomatoes, coffee, tea, smoking triggers or worsens it, i'm a guy, 28yrs old

during these times, after a bowel movement, i am totally weak and drained, i cant live like this but too shy to have a colonoscopy etc

Help please, isnt there something i can take?

Me