I also got it second time around. My GP was fantastic, and between me and him we had a good action plan. As I saw him quite often (2 boys = see GP lots ), he was monitering me during their visits. One visit when I saw him he was seeing the signs well before I admitted anything and so I went back and saw him by myself and had a good chat. I was put on the meds straight away (didn't go on them the first time), and within 2 weeks I was back to normal (for me). I could of seen MMH but I had a BIL who was working in mental health at the hospital I was to go to, and I didn't want him anywhere near me.
One think I tried to do was to get fully stablished with everything in the hospital and not get kicked out earlier than when I needed to. I thought that if I had everything going well then it wouldn't stike (boy was I wrong). I also had some personnal issues happening at home that lead to it as well (which my dr knew about).
So long as you are open with things with people you trust, then you should be able to manage it 2nd time around if it does strike.
Best of luck.