I'm just a begginer at this game but to me:

pre-flop, this looks bad. If you want to limp late on in a loose game then I can kind of see it. But, when the big raise comes back to you it's time to get out.

turn, doesn't look so bad but it depends on the guy going allin. If there were any significant number of callers before you then I'm not sure it's a call. But you get HU with a nut low draw and flush draw. You're getting about 5-1 which seems ok? But they are weak draws, the low could be counterfeit/miss and the flush is a long way short of nut. I think you can call HU tho.