Tbh I wouldn't have let myself get to day 4 on a bug.
1) is there a better way to solve the problem / have I gone down the wrong path and caused this issue myself?
2) is there no one else in the company that can help me go through the issue and come up with a solution?
3) hire a freelancer to fix the issue for me, review their solution and learn from it..
but there will be many choice words within the first few hours of trying to fix a bug never mind day 4...
:)