She definitely took advantage of you. Not cool. :(

> ... care aide worker ...
>
> If the situation was reversed and it was an Older Man picking up a very drunk and very financially poor woman and then offering sketchy drugs and accepting oral sex while that woman was still really drunk and high, when she did not realistically have the means to get home safe, then that man would be reviled and possibly charged with crimes, possibly tossed from his job, especially if he worked with vulnerable persons.
>
> But I dont really think anyone will belive me, or hear me.

It might be worth a try.

Telling her company

You could report the matter to her company. If you do this, you could start with her boss. If this doesn't help, you could gradually work your way up the chain of command, even to the CEO of the company or your state or province's department of health. It might not work, but it still might be worth trying.

Trauma therapy

If you want money for trauma therapy and/or other professional counseling:

• You could try to sue her in small-claims court for sexual assault. You don't need a lawyer to do this. Still, it's wise to get some advice from a lawyer before launching any lawsuit. Many (but not all) lawyers will give you the first half-hour of advice for free. It's easier to win in small-claims court than in criminal court.
  
  
• If you wish, you could also try to apply for victims' compensation. You might need to file a police report first, but you might not need to press criminal charges.
  
  

  Unwanted romantic pursuit
  

  
  /u/TakeOnMe-TakeOnMe is right. We don't yet know whether or not she actually will stalk you.
  
  The book The Gift of Fear has some good advice about dealing with unwanted romantic pursuit and/or stalking, in case it does happen. See, for example, the chapter, "Persistence, Persistence". Your local public library system probably owns lots of copies of the book; the paperback is about $5 on Amazon.
  
  I think it'd be useful to tell her, once, early on, that you're not romantically interested in her at all. You can explain that this is because you two are "not a good match".
  
  

  Your drinking
  

  
  Early in your post, you expressed dismay about your drinking. If you want to cut down or quit, and you want suggestions, please let me know.
  
  

  Postscript
  

  
  Please keep us updated.