Until very recently I used to work in a field relating to NHS complaints so my advice would be:
Yes, make a complaint. What you've described is very bad, in terms of severity and potential consequences. However you don't have to do it now, or even in the next month. When you're ready is fine. However if you think you'd like some support go to PALS now for that.
The only thing I would do is make a note of any of the names of relevant staff you can remember now, together with exactly what they said, and what time, as that's the sort of thing that can fade quickly from your memory particularly if you're under such stress. If you're not sure about names make as detailed as physical description as you can. For people like the consultant it will of course be easy for the complaints dept to identify them, but if it's just 'a nurse said this' it can be surprisingly easy for them to wriggle out of being definitively identified.
When you do get to making the complaints you can either go via PALS or directly to the hospital/trust. They usually prefer you to put your complaint in writing but they should allow you to do it via a phone call if easier for you. You don't need a solicitor or advocate but can use one if you wish.
Most complaints take aaaaaages to be processed. The timeframe target under relevant guidance is 30 days to receive a final response - most, particularly if they are very complicated, take a lot longer - like up to two years longer. Yes, that's a disgrace.
Depending on where you live, once you receive a final response, if you're unhappy with it you can either choose to take legal action, or take it to the Parliamentary Health Services Ombudsman, or devolved equivalent.
hope dd gets better soon