Tongue underside looks greyish. Its own?

I have  posted earlier about my Constant jaw and neck pain which is ongoing for an year now. This post is about the tongue. I have used a new mouth wash recently (for the last 4 days). That's the new thing I did. I noticed some redness and swelling at the base of my tongue. It's red and looks swollen. It feels itchy and very sore. It feels like skin bruised when I run my tongue over that area. Is this normal or should I go to dentist immediately? Nothing was spotted before and this redness appeared  on Wednesday when I woke up. I took ibuprofen for last 2 days and redness reduced. The mild swelling is still present. I see my underside of the tongue as greyish and darker than before.  Is this normal? I also feel burning sensation on the throat and tongue upper side.I do have reflex issues. this is reflex or because of that mouth wash?taking tagamet for reflex Is this something serious? Will it go away on its own? Attaching the pics. Any help is really appreciated. Thanks a lot.