need some advice

At the beginning of the summer I decided to get back in the pool after a year or so off. I do not compete anymore but swam competitively all through childhood, high school, and college. I also played water polo for about 6 years. It is sufficent to say I have a good base and a year is the most time I have ever taken off from swimming (oohh how I regret it). I also turned 30 and the metabolism is no longer what is once was sadly. So, a big part of me wants to be at least a little closer to my old workout interval times. Like I would love to stop doing 1:40 100's on a 1:45 interval when I used to do 1:15s with NO problem. Another big (not too big mind you) part of me would like to lose some weight. I started the summer with 2000 yards in 45 minutes and around mid July stepped my workouts up to 3000 yards in about an hour, this is 4-5 days a week. I try to push myself on two sets in the workout and then just try to get through the other stuff without becoming too bored, keeping a good pace though. My clothes fit better but the scale hasn't really budged but maybe two pounds since I began this in June. Is my body too used to swimming?? I always thought when people said that it was crap but now I am confused. I also get tired sooner in the pool, like my arms are semi sore by the time I am done with 1000 yards and I have to breathe on almost every stroke (usually I can start off breathing every four, I do not alternate-never have- I choke when I do, but then begin wanting more air). I would like to begin incorporating weights into my workout and perhaps even cross training a little. What do y'all recommend? What should I be focusing on with weights and how often? Should I lift the same day I swim? And...any advice on if I am doing the right thing to get a tad faster? Any help would be great! Thanks. I'll stop writing now :agree:.:blah: