Yes, I think this is a good idea. I've literally texted MC just to basically say, "You're still there, right?" and he responded that he was. Or like last night, when I was upset after session, where I e-mailed my T to confirm that he does care (to which he responded very kindly).

I often open with something like, "I'm really struggling right now, and..." But I think what EM said is really good, where you acknowledge that you want to reach out but are afraid to.