I did the Marshall Protocol about 3 yrs ago. Because I had had great but brief bursts of health when on abx the protocol appealed to me. It was quite difficult to find a doctor to support me on this, but I did eventually find one. I did the MP for a bit over a year and had mixed experiences on it. In phase 1 I felt slightly better but not by much. In phase 2 I ended up feeling really good, and was keen to start on phase 3 asap. When I added the clindamycin even at very small doses I felt rotten. When ever I slowly increased the dose I felt worse each time, and would have to drop back to the lowest level, this went on for 8 mths and I was really having a lot of difficulty coping with everyday life and was very depressed. I had been on clindamycin before by another CFS doctor for about 10mths and felt rotten for much of that time, and when I started to read more comments from other advocates of the protocol now extending the time for which one has to persevere the herx for 2-3-4 yrs, I realised I could not do that and avoid the sun for that long, so stopped it. I continued on with the benicar for a bit longer, but possibly not enough as my health never recovered to the level I was before I staretd the MP.
I also think avoidance of Vit-D is not the right thing to do for non sarcoidosis patients. I also think for CFS patients anyway, dropping all your other supplements is not a good idea. The advocates say dont worry you wont need them as your body recovers under the MP, but then they keep extending the recovery time out to years. IMO If someone is on hormone replacement therapy, going off that for a longtime while waiting for the MP to work is not going to help your recovery. I was also put of by the cultish nature of MP devotees and how anytime anyone had problems with the MP, that was consdered herxing and a good thing,