Pulling hair out , I need help PLEASE !

I have been working forever on my website.15 to 18 hours a day.Plus trying to learn html.I thought I knew enough. NOT !! Pretty much satisfied with the look..but behind the scene . OMG…html error city. Now I have a syntax error … HUH ! I have umteen html editors. But it just messes things up. OR .I don’t know what Im doing there either.
I’m looking for someone that knows how to fix errors.read html. I will pay and or advertize for you on my site..BEG.if you like.
It will take 15 mintues for someone that knows what they are doing.Me.well forever. I need it out on the web..going broke buying things to fix it.