howdy keebs and welcome to the board. If you get a chance, check out the thread under open titled "getting to know you". Tells you all about us and gives you a chance to tell us some more about you - if you're so inclined.
As for getting back into biking: like bikeless (no more), try spin classes as a change of pace from the trainer. There are also spin videos you can get to pump up your trainer workouts. If you've been sick for awhile (or even if you haven't), always always always listen to your body - it's better to sit out a day or two then to overstrain and end up sidelined. When I pick something up or get back into something, I always think in groups of 2 or 3: I ran/rode this far today, if I can do that same distance this comfortably 2 more times (or 3 more times) in a row then I'm ready to increase. "in a row" doesn't necessarily days in a row. good luck and keep us posted! and welcome back to the wonderful world of cycling!
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"