Im so confused what my next step should be

I get private GP appointments through my work (only appointments). And I was given an open referral where I can choose anywhere for my assessment.

Issue is im beyond broke but also need the medication to help me onto getting a job with my degree (it's been an issue...). But overall I really want the meds to be covered by NHS mainly. Assessment I would like to as well but if the waitlist is too long I'll just pay.

So I have no idea what to do. Do I pay for ADHD360 for the assessment? Do I need to keep paying sums of money for their check ups or? I dont know what this titration thing is either.

Can someone lay it out straight for me? It'd be extremely helpful because I'm not finding the information properly from google at all.