i know exactly how you feel. it is hard to hear people complain about a stubbed toe, or how tired they are, or other menial and ridiculously minor things. Whats really hard is not slapping them when they complain.
Its difficult because when they look at us, they don't see the pain we are in, so its easy for them to forget what we are going through. Hopefully your boyfriend is very understanding of your illness, he will need to be. My ex-girlfriend could not handle being with someone in constant pain and lament.
things do end up changing, like not being able to picked up. i went through the same thing when i realized i couldn't even pick my girlfriend up, that was very emasculating.
You really just have to roll with the punches, i know law school is alot to take on, especially with FMS, i wish you the best of luck. You've got the right idea by celebrating the small victories, you got out of bed and didn't cry, then let it be a good rest of the day too.
consider this: if you finish law school, or even if you don't, even if you just keep getting up out of bed every day and facing the world; you are gaining so much character, work ethic, and knowledge about the real world, that everyone else who goes around complaining about stress or exhaustion, will never receive, and never understand. i try to consider this alot as the upside, if i can do what I've already done with FMS, i know i can do so much more, if i just keep at it, and so can you.
and talking does help, it was cathartic for me to be able to reply to you. i hope you continue to seek help from the community, you've always got a place to talk here.