My T has gone away and I have no idea how to make it through without her. I have nearly 6 weeks to get through and it's just dawned on me that I don't think I'll make it

I don't know what I will do, but I'm not looking forward to seeing how it goes. I'm starting to notice my negative thought processes and feelings taking over, and have been using more alcohol to escape from myself. I didn't realise how hard I would find my T's absence.
T has given me contact details for a colleague, but I'm not sure whether to email/call or what I'd say if I did. I'm just not feeling like I can face the 6 weeks. I don't feel I have the strength to keep myself safe for that long and I'm really apathetic about making it through. But I don't want bother the colleague by calling if it's not necessary. Would you call the colleague? What would you say if you did? It's only been a few days so it's pretty pathetic, I know, but any advice would be appreciated.