Welcome to our forum(s), 4 years is not as long as it may be for many Bipolars (I know it may suck) and you are NOT drug resistant, there is so many more available (sp?) than years ago when my brother first was DXed (early 1960's) sad to say it took about 8 years for the right med.
I am confident, due to my own experience, it will not take that long, but you must stay compliant with your pdoc, meds,etc. Sorry, no magic meds for this, maybe the hospitalization is needed, to help keep you safe during med trials. I had to do that when I was first DXed with Bipolar II (family things brought this out, many triggers) it took about 2yrs to get the right med., I preferred the wait and trials of various meds. after going through depression that embraced my soul.
Bottom line, take the chance, try the hospital scene, the meds the docs., just do not let the monster take you down, life is too short, and amazing, you may not see it now, but it can be great, so carry on

Feel free to alwqays come here and talk, and if you wish, PM me

Take care,

DE