Sometimes things which seam like they make a situation worse actually can be the first step to making it much better.
It is possible this is the case with your ex wanting to be off the tenancy, not having a guarantor and not being able to continue your business that fits around your young childs needs.
Your current/ new situation could put you very high on the housing list. It would certainly be worth a phone call explaining the circumstances - dont underplay it.
You are obviously a big survivor but its time to let society help and not downplay to housing the outcome of not having a guarantor and not being able to work have a real impact on you.
This could give you much more security in your accomodation. Depending on what your business is, you could even discuss if you could get housing where this can continue.
We all have a hierachy of needs - you're meeting your DD's she is warm, dry, loved, fed, accomodated, safe.
Beyond essential basic needs its really good to think about your wants. Breaking down what is important to you can help you to plan which life problems to tackle first. What is your dream?
Small steps in the right direction really help that.
I was a single parent with two DC 1 and 3. The eldest was and is severely disabled. At the time I couldn't get access to most benefits we didn't have his pages and pages of diagnosis he has now - just complex case. I couldn't get childcare, they weren't able to offer my eldest full time school when he was old enough - he was given a place they just regularly asked me to keep him home or phoned to say he'd had enough. I eventually got onto tax credits and did a lot of buying and selling online.
Breaking life down into smaller steps helps. Whilst the DC were very young I didn't have a great life plan. The young years go by fairly quickly and flexibility and options increase as they get older.
I do remember it felt impossible at times. I felt trapped and like a failure. Roll on 14 years - We are warm, dry, over fed, housed, happy (and I'm remarried with a third child). DS who couldn't fit into school ultimately got into special school and is now in an apprenticeship and thriving.
I have a very full time business that I started whilst single and on benefits with selling old items, then buying to sell. Ultimately this became a full time job and a living, fitting around the childrens needs - we got completely off benefits.
There are various schemes around to help young business to start up. Natwest run a few for business' at various stages, some of these include a period of free work space. There is also the enterprise allowance - a JobcentrePlus scheme where you can potentially get your benefits and earn for 6 months to help you get established. The scheme also offers start up loans if you're on qualifying benefits. You need to have make a business plan but should be able to get help off the scheme as part of the process is to provide you with a mentor to help you negotiate the early stuff like putting your business down on paper as a plan.