@littledragon99 you're becoming fixated on entirely the wrong things.
You cannot withhold rent for a room not listed in your AST, even if it were listed you would not have grounds to withhold rent but could have tried to negotiate a reduction due to the loss of a communal space however as the lounge isn't listed in your AST it's a moot point.
From your posts it's clear that the house isn't a HMO as the landlord rents out 2 rooms on AST and uses Air B&B for the other two. She isn't breaking any laws or regulations here by doing it this way. Even if it were a HMO you still would not have grounds to withhold rent, so again this is a moot point.
Your deposit being lodge late in TDS late does not allow for you to withhold rent. It may mean that should she try to evict with S21 that she may have to pay the deposit back before she could (entirely dependent on when she received the deposit as that's when the 30 days starts so may not be late) in any event she can deduct your rent arrears from this amount making it also a moot point.
Given you've said all of your bills are included, this likely includes the provision of the cleaner and should be accountable in the AST, whilst it might be an inconvenience for her not to tell you when she is coming if you have agreed to it you don't have a point to argue on and certainly isn't grounds to withhold your rent.
You signed your AST for your bedroom, use of a bathroom and kitchen. If the landlord stores their belongings in cupboards and have done so prior to commencing your tenancy and your AST doesn't cover sole use of these areas you cannot withhold rent on these grounds.
Please stop getting bogged down on the above, it is doing you no good, these aren't excuses or reasons to withhold rent. The issue you need to focus on is paying your rent and coming to an agreement on a payment plan to repay the arrears. Blocking your landlord is inflaming the situation and will likely push them to evict you as soon as the opportunity arises.
Legally you are on very precarious grounds. Your rent should be paid first and foremost above all other debts. Your overdraft and credit card/loan debt are all secondary to your rent. You need to set up a standing order to pay your rent, contact your landlord and come to an agreement on how to repay the arrears. You can't continue to pay your rent late and ADHD isn't an excuse, the reality is, as an adult, you are responsible for your own bills and shouldn't need reminding.
Please speak to Shelter regarding your housing situation and speak to CAB regarding your wider debt situation and stop putting your head in the sand, continuing as you are will almost certainly lead to an eviction which you will have virtually no legal grounds to contest or defend. Whilst I have sympathy that you clearly are struggling with life and a bereavement, you need to take some responsibility and begin positive steps to form a plan to get your life back on track.