I think it's the chronicity of your health problems that is stressing the both of you out. Get the very best medical help you can find to help you manage these conditions.

You mentioned at the top of your first post that this loss of intimacy seems to have started with your loss of self-esteem and you and your boyfriend gaining weight. What role do you think the weight gain, on both your parts, has played?

Is not having the demands of school reducing your chronic fatigue and pelvic pain, or allowing you to better manage these problems? Your boyfriend may be concerned that you will be continually unable to participate in a spectrum of activities. He may worry that you will be unable to eventually sustain employment, leaving him alone in managing the household finances.

As I was saying in my post above, with chronic problems, it can seem especially stressful. He may feel overwhelmed by you having problems that he sees as having no end in sight. This is why I recommend getting the best medical care. You are going to have to convince your boyfriend that these conditions are managable and that flare-ups are time limited. If he sees that life can be normal, in between flare-ups, then he may be able to adapt to you having these conditions.

You need a supportive, understanding partner. Not everyone can deal with having a chronically ill significant other. Consider carefully his ability to do that before the make the commitment of marriage to this man.