definitely see a GI specialist. IBS is just doctor speech for, "theres something wrong with your digestion, but i dont know what." There is something causing your IBS, whether its crohns, celiac, UC, food allergy, parasite, SIBO, or soemthing else. Seeing a GI should help.
What you can do to try and help yourself is to keep a food diary of everything you eat and drink to see if you notice any food in particular causing you trouble.
Also, dont eat after 7pm.
Metamucil is good, really any type of fiber supplement, but just like a medicine, there can be side effects. The trick is to keep trying a bunch of different ones til you find one that works for you. Also, you need to drink a lot of water (60oz a day).
I'd also stay away from stomach irritants. i.e. gluten, dairy, acids, etc.
We sound the same had2share.com