I had headaches when i was trying to hard to do something and I wasn't strong enough yet to do them. For me if i was trying to brush my hair or do something that involved lifting my arms up and looking upward, i would get a headache after a minute or so. Docs just told me to take it easy and try to do things for myself, but if what i was doing caused pain, to not do it.
I am not sure about infections showing up on MRI's or not, but if you don't believe they are accurate, or you want another opinion, get another opinion.
I sometimes wish I got another opinion before I went through my treatment, but I believe my doctors were some of the best in the state because of research my mom did, so I went with what they said to do.
Also, if he's not ready for this, you can look on here and kind of help him through with stories you see on here. I now talk with a woman who went through almost the same thing I did, only a few months after I did. For the most part, I talked with her sister on here, because she couldn't get on here, and I am glad I was able to help her through radiation and still.
Some people can jump on here and share their stories and read others, while others just can't handle it.

I wish you both the best and hopefully if you get a second opinion it doesn't turn out as bad as the first one.
I couldn't imagine having my boyfriend not by my side when I went through my treatment. You are one strong person for being able to do so!