I was wondering which choice below sounds correct in AmE when you are suffering from a deep feeling of guilt or remorse because of something wrong you have done or forgotten to do etc:

a. I have a guilt trip.
b. I'm going through a guilt trip.
b. I have a guilt complex.
c. I have a guilty conscience.

To me, the most common choices are 'a' and 'c' and have no idea whether the other two are as common as 'a' & 'c' are.

Please kindly enlighten me.

I was wondering which choice below sounds correct in AmE when you are suffering from a deep feeling of guilt or remorse because of something wrong you have done or forgotten to do etc:

a. I have a guilt trip.
b. I'm going through a guilt trip.
c. I have a guilt complex.
d. I have a guilty conscience.

To me, the most common choices are 'a' and 'c' and have no idea whether the other two are as common as 'a' & 'c' are.

Please kindly enlighten me.