Hello Kate,
I recognise your feelings of isolation. I am lucky to have lots of good mates and suchlike, but even so having a diagnosis like this is so *BIG* that it is hard to get to grips with even so.
Have you got a confirmed diagnosis yet? I found that I felt better once I had a name for my pain....
The funny walk (I think of it as the "drunken sailor" gait) might come from peripheral neuropathy (screwed up nerves in your extremities) which can come and go. I have it bad at the mo if I go further than 50m, but otherwise its OK. I use a stick to get about with for "long distances" (i.e. outside the house) but MS is such a weird illness that this might go away.....
Don't let your mother in law get you down. Look upon this new part of your life as an excuse to come down on her like a ton of bricks when she is a cow. If your husband looks badly on your shooting his mum down in flames, blame it on your illness ("I am so upset about this...she didnt realise how fragile I am...." blah blah.... Lets face it, if you *HAVE* to be ill, at least you should be able to enjoy some of it

)
Look after yourself and TAKE IT EASY.
Pylo (Phill)
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.ekoj a ekat t'nac yeht fi me' kcuF