No.1 deserves no answer, or as Piltdown Man put it.
No. 2 vector to VMC. If impossible, vector for an IAP. Turn coordinator & directional gyro for bank and altimeter & VSI for pitch. I bet it's harder to accomplish in real IMC than under the "hood" as is always practiced during flight training.
No. 3, reset alternator, check CB, reset once if popped. If not successful, vector to nearest suitable aerodrome. Be aware you may run out of power completely, thus no navaids. If you can reach VMC and land, go for that.
No. 4, if you can't maintain visual from DA/MDA you go around.
No. 5, you have painted yourself into a corner and left no way out? Sounds like the same nut job as in No. 1. You shouldn't be there in the first place. To answer the question, what better alternative do you have than try the same approach again?? Declare an emergency and hope for the best.
No. 6, if I am unsure about my terrain clearance I would query ATC before doing something stupid, e.g. asking for Minimum Vector Altitude.