Strange day

Strange day today, I keep losing! In the afternoon, I was unplaced and third in another. then I lost £10 in cash games. In the evening, I was unplaced in both games. The second was a travesty. I held QQ in early position and raised to 110 chips (15/8 blinds). I get 4 callers including BB. So, the pot is about 450 chips and the flop comes 332 with 2 hearts. I bet the pot and only BB calls. BB has the flush draw and hits it. I'm down to 200 chips and eventually peter out. The flush draw is a strange beast. I'm pretty sure that people don't understand the pot odds.