Thank you to everyone that's replied, an still having my ass kicked today so am away to bed.
I promise I am trying to delegate however I am the sole director in charge of 16 staff for a cash flow, 7 days a week business.
When I was at the beginning of being diagnosed we were busy starting a brand relaunch with refurb etc and that project is still ongoing. My manager has just left for the holiday of a lifetime on the other side of the world and my other manager is getting married in a few wks. They're both amazing but they shouldn't have to worry about what's happening to me interfering with their lives.
DH is amazing and will step up where he can but already works extensive hours of his own (think emergency services type work) and helps massively with the 3 kids.
There isn't really anyone else to delegate to and whilst my friends are being amazing they don't know how to run my business or make sure we are fulfilling commitments.
I spoke with Macmillan but because am self employed I was passed to a business line. They essentially told me that as I don't have a business loan/overdraft or any lending OTHER than a directors loan to myself, they can't help. If my health deteriorates I should close or sell up.
I've worked so SO hard for this business. I've poured everything into it to provide a future for my kids etc and I'm just trying not to knee jerk react.
I've just missed out on an amazing opportunity for expansion and will now have to deal with another business opening in a competitive manner almost next door. We have a unique location and whilst I'm confident in our brand and products it WILL have an effect.
Today was spent with the book keeper making sure I haven't missed anything. The printer for all the final decisions re the new literature etc and answering messages. I haven't been 'hands on' in weeks and yet am still exhausted.
My wage bill has increased approx £2k a month due to my absence and had this not been a VAT month we'd have been ok.
I've spoken to the company we lease our business vehicle through and they've agreed to take it back. Without being able to fulfil business commitments it's too large so now I have to car shop too 
The VAT phoned and announced an inspection in the new year and I essentially told them to f*ck off their timing was shocking and I wasn't in the mood 
I'll contact Macmillan again tomorrow to see if I'm owed any benefits but am kicking myself for not getting critical illness cover on my life insurance when I moved from being an employee to self employed 
Sorry. Moaning.
And pain killers not touching the side and am bunged. @BitOfFun did you mention something that helped with that? I can't remember.
Will jog off with my moaning now....