another warm swim

I got no sleep Tuesday night so I took a nap before meeting Bryan and Col at the epicenter to swim around 8pm - since our guest passes were still good. I was also supposed to spin for 45 min but I felt I needed a nap more so I skipped it and rested so I could focus on the swim work out. The pool was once more very warm - though I don't think is was as bad as last time. Col decided on a 400 warm up, then doing 200, 150, 100, 50 four times and a cool down if we felt like it for about 2400 yrds total. The biggest goal was to not rest and chat to long so that we finished in a reasonably amount of time. (I think she wanted to make sure I was really able to swim this distance in under an hour since when we swim together it seems to take longer.)
I felt generally good the nap helped with my energy level. My left shoulder has been bothering me lately and it continued to the entire swim. I know it does not help that when I get tired I get lazy about my form esp on my left side and start pushing down or swinging wide which hurts even more - go figure. Col swam right next to me on the 50's in an effort to get me to push myself harder - which I did. Most of the swim I averaged just under 2 min 100 pace - with a few faster sets in there as well. I finished 2450 yrds in about 57 minutes.
I'm kind of worried about my shoulder - it just does not seem to be getting any better. I think Pilate's would help but the gal I was working with is all booked when I'm available. I have been considering going somewhere else but I'm not really sure. The other option is going to the doctor or a pt about it - but the last thing I want to hear is to stop swimming since I feel like I'm finally making some progress. Though I think some ultrasound would help loosen it up.. Anyway I'm going to have to figure something out soon.