I am a slow healer as well. I had my sleeve on may 27th. I felt OK in the hospital... then went home the night after and spent the next 9days on clear liquids and unable to progress to full liquids or any proteins. I lost a lot of muscle strength during that time. I am now finally in between full liquids and light purees! My body hurts like heck and I am still rebuilding my strength via swimming and water resistance. The chest pain was most likely the co2 gas trapped in your tissues trying to work it's way out of your body. That was quite uncomfortable.
I have tried to look at my day and find the one positive change each day and focus on that! Like...the 1st day I did not have to take meds for nausea, the first day I got my 64 oz of fluids, the first day I met my protein intake!
I am not saying all is perfect but I will celebrate my positives which helps me have perspective that in spite of how crappy I feel right now I am making small progress!!
Generally it takes 6mo-1year to totally feel right after the trauma of surgery.