Should I set this doctor straight?

I had an infection. Gut type infection probably food born I will spare you the gory details. So I went to my favorite clinic doctor he gave me some medication I thought it was gone but it came back. So I went to a different clinic because he wasn't on and got a more aggressive dose. I took that and it went and then cycled and came back. Then I went to a THIRD clinic doctor a new doctor and she looked the dose up in the drug manual and said the dose for one pill originally should have been 500mg not 100mg. She gave me 600 mg to be taken over 3 days and hopefully that will eradicate it for good. The first doctor started to think that it was irritable bowel and that I was nervous. It irritates me that if he had given me the appropriate dose that i wouldn't have had to be battling it for this long. And now he has me as some nervous chick when it was his fault for not giving me the appropriate dose. I feel like going back there and setting him straight because I am tired of women being shuffled into that category when something doesn't clear up. This was him not me. Not to be angry but just to discuss the issue. Also how many of you have had to go into and insist on something because a doctor just thinks it is all in your mind.