I know you are not Pebber. By lessons, I'm talking about Pebbers youtube vids, mostly the multi part daily practice one. I know classical seating position, tomorrow I will spend my entire practice in that position and see if it helps. I'm not going to get a teacher as I cannot afford one, which is pretty much the reason I study Pebbers vids. I mentioned in my original post that i've never had a proper guitar lesson, I basically made up my own practice routines. Not being able to afford lessons is pathetic, I know, and I'm nearly 30, but I have gotten pretty far on my own so far. My left hand and fingers are strong, I've been playing acoustic for the past 5 years, and it just beefed up my left hand. I just got bored of playing acoustic and put it down, I did have an electric before that though. Stamina is not a problem, my technique is what needs work, especially my right hand with picking ect. But also left hand/finger position. My fingers didn't hurt after 4 hours, my wrist did.
The injury to my left elbow (tendonitis) was not guitar related. I do appreciate the advise though, thank you.