Wow, and sorry to read of the difficulties you are facing. I never experienced what you are going through now, but am familiar with bad infections and peripherally inserted central catheters as my brother had endocarditis, a heart valve infection, last summer - right before my AN surgery. His infection required open heart surgery to scrape out the visible infection, apply disinfectant, and repair the perforations in his mitral valve. Following that he had a PICC line for 5 weeks to administer antibiotics to be sure there was no more infection. He, too, was allergic to one of the antibiotics and was shifted to vancomycine. That drug caused wild swings in his sugar levels and he was on insulin daily. Today he is fine.
It is easy for me to say, but you will get past this. Try taking this in managable amounts, like a day at a time. Try not to think in terms of weeks, or how long until the end comes. Time will pass faster that way. I wish you the best for the next 6 weeks and keep the forum posted if you can.