Folding KK

Played again today and ran very well and won about $80. Only one kind of interesting spot:

Hand

I ended up timeout-folding, but I'm definitely not sure that was the best play. I don't mind getting it in against the 4bettor, who I don't know but who I think is too loose. But I'm not totally comfortable getting it in against the 3bettor, who is a solid reg, even though he's 3betting a little lighter than average over the 400 or so hands I have on him, because we're 150bb deep. I feel like folding is so nitty but I have so much trouble formulating a good plan for calling or 5betting. Maybe I could flat, call one bet if an A flops and then check/fold down, bet once if no A? Maybe I could 5bet to $22 and fold if the reg ships? Maybe I could 5bet and call it off? Maybe I could...do something else? Quit poker? Join the circus?