Back to pool, back to pool, to show to dad that I'm not a fool

Got back into the training last week with a solid 22k of swimming. It's only getting worse this week. We had a hard set yesterday and when we informed Sean that it was hard he let us know that "Friday will be our worst swim workout ever." I best be ready for that one as Seans dished up some mean swims in the past.
Yesterday was 5200y of swimming with a main set of 12x100 with the evens on 500y goal pace the the evens just 1-3 seconds slower. My arms have been tired from getting back in the pool but I swam this set well - 1:05 to 1:08 on the hard ones and 1:10 to 1:12 on the "easy" ones. We should have team goals today (usually 6x100y all out) and then Fridays predicted hellish swim so it should be a doozy of a couple days.
I was getting incredibly hungry during the swims which often happens when I'm putting in successive days of hard swimming. I feel like I get depleted and then after 3500y of swimming all I can think of is food. Normal sport drinks helped but weren't cutting it so I went with the grand daddy sports drink of em all, Hammer Nutrition's Perpetuum which packs 260 calories a serving. That definitely does the trick. I usually reserve Perpetuum for long rides of half ironmans but it's also serving me well on these long swims.
Matt Balzer has been crushing the swims as of late and we were getting out of the water together at most races we did so that has me hopeful that I can make a swim breakthrough like he has. If I can get my team goals all under 1:00 I'll be happy.
I'm running so little now that even the 50min run I did yesterday has my legs a bit sore. Starting to feel like a normal everyday runner, running actually hurts now. The first 30min feel great since my legs are fresh but then all the sudden I start to hurt where I shouldn't hurt, the back gets sore, shoulders get tight.