Is Mark approaching his mental limit?

I am wondering if Mark is reaching the limits of his mental capacity for stress and trauma in this show. He already was struggling to grieve the loss of Gemma for 2 years. Now he finds out she is alive in some capacity. Then he begins the process of reintegration, which doesn't seem like a picnic. We still don't know how that will affect him. Will it be painful and disorienting like Petey's? Or smoother because he might follow post-procedure instructions better? Once he reintegrates more, he will then have the emotional conflict of developing feelings for Helly and understanding the full breadth of grief for Petey's death. This isn't even taking into account the possibility that Gemma is somehow not her full self and he might have to mercy kill her in some way (possibly Reghabi's cutoff line from s2e3).

Now in the latest episode, he is sexually assaulted by someone who he believes is someone else. It's a major breach of consent by his innie and Helena. Then, to top it all off, Irving is now going to be terminated/memory wiped/something.

This is a lot! I don't know how we are expected to believe this wouldn't push someone to their breaking point. He already drinks a lot. Could the pill bottles in the S2 intro imply further addiction issues? I wonder how he will cope with all of these new revelations. Is this realistic? Or pushing the limits of believability?