Need a knee assessment again to assess each of the knee stabilising structures - MCL, LCL, ACL, PCL, menisci. In the meantime - RICE for when it swells to control swelling. Certainly sounds like the knee currently has stability probs if you feel like its not holding you, particularly in twisting motions.

Prob need a course of rehab again to retrain knee control and stability mechanisms.

If your current swelling is minor and is time delayed (ie, it is usually a day later after activity) - chances are its not involving the ACL (althou reco-ed ACLs may present differently) but cant tell over a cyber-consult!!

Good luck.

PS: Yes a knee brace may help at present moment to regain stability but is not a long-term solution as your muscles wont relearn to control your knee.