Hello and welcome to the site 
Getting a diagnosis is one hell of a thing to get our head round, but the added complications of being self employed, a dance teacher and a carer is going to complicate things even more 
The one thing that I can tell you is that in RRMS that we get remissions after relapses, albeit often imperfect ones, so if you hang in there, you will hopefully notice a difference soon.
In the meantime, I think you should be asking your GP for help with your sensory symptoms (a neuropathic painkiller like amitriptyline, pregabalin or gabapentin should make a major difference once you get on the right med and the right dose, but don’t be tempted to rush the dose - build it slowly to avoid side effects). Your GP can also refer you to neurophysio for help with your balance. If you’re the kind of dance teacher that demonstrates to the older students, I’m betting that your core muscles are pretty solid - this will be a big advantage. The neurophysio will help you to teach your body which way’s up again.
As far as work goes, if you have your own school, could you get the older students involved in teaching? You can direct things from a corner?
What you can do to help yourself is fairly limited Lots of rest is important when we’re having a relapse. A healthy diet and not smoking are good for the long-term; regular exercise without exhausting ourselves or getting too hot or dehydrated helps too. Taking a vitamin D supplement is also widely recommended for MS now - most neuros recommend 4-5,000iu a day. (You can buy Healthy Origins 5,000iu capsules quite reasonably on-line, but do shop around for brands & sources as the price varies a lot.)
The other thing that I recommend you do is phone Social Services. If you are finding it difficult to care for your husband, never mind yourself, then they are the people who should be stepping in to help. You could also look at what benefits might be available to you, if work is impossible just now. The DWP do an on-line “benefits checker” you could use to see what you might qualify for. Get some help with any forms you fill in - they are full of invisible tripwires!
With any luck you’ll find life a lot easier once you get the right neuropathic painkiller. Some GPs do not like to prescribe meds without authorisation from a neuro or MS nurse though so it may be quicker if you phone your nurse to ask about meds before your GP appointment. If you can then tell the GP that your MS nurse recommended that you try, e.g., pregabalin, you are less likely to encounter any problems.
Final couple of things: you should check through any paperwork you have that might have a critical illness clause (e.g. your mortgage) because MS is a payable condition and you need to tell the DVLA about your diagnosis (they typically put MSers on a three year renewable (for free) licence so they can keep tabs on us) and then tell your car insurance people what the DVLA decide (they can’t change your insurance premium).
I hope you start to notice a difference in your symptoms very soon.
Karen x