I think this isn't an uncommon situation unfortunately. However there are some positive things you can look at in the situation. Firstly, usually student overdrafts have very favourable terms - you often have low interests rates or even now interest for extended periods to repay money back into it, which often roughly corresponds with your SFE maintenance loan disbursements. Also usually you will not immediately have the terms changed when you graduate in my experience, they tend to transition you over the course of a year or so to a graduate account so you have time after graduating to get a job and pay off the overdraft. Having some overdraft debt from a student overdraft is often more manageable than e.g. a lot of credit card debt or something, I think.
While you may not be able to work that much during term time and on placements, are you able to look at picking up more work as a temp or something over the summer? This may allow you to build up a bit of a buffer over the summer, to then eat through during term time when your earning potential is more limited due to your other commitments. Depending on your placement times you may also be able to look for shorter term temp roles over the winter and spring breaks as well (often during the winter period stores and the post office/royal mail hire christmas temps!).
Looking slightly further ahead, while I can sympathise with wanting to live with your friends, I think you need to recognise that if you are genuinely friends, you will still be friends even if you don't live together. So you may want to explore options for living in cheaper accom elsewhere and just hanging out with them instead. This may make a big difference in your financial situation and should not significantly affect your social life (and if they stop being friends with you because you aren't living with them, then well...you're probably better off without them anyway!). Alternatively discuss the financial situation with them and see if they would be willing to look for somewhere cheaper to move into.
There might be smaller changes you can make elsewhere (actively seeking out discounts/bargain hunting, limiting additional "social" expenses from going out frequently etc, switching to cheaper household products and so on) but these will be pretty small amounts relative to just finding somewhere cheaper to live that isn't living with your friends in the current house.