First allow me, to give a general hint:
I know, that waiting for help sometimes seems lasting endlessly.
If so, try to find answers while reading the older posts. This thread has a very lot of hints and you often will have luck to find, what you need.
This way you don't have to wait for someone to reply.

@Shadow:
I don't think, that this is a cellphone (the man in the Music Inn is using), because Tom tells you, that he is smoking (if you look at him).
Did you see the business cards on the table?
Try to get one. After that ask the secretary for to give one to you.
.... and now there is your chance to ...
@Fribbi
You can change something for to get the medicine.
Search in Mathildas room for it (it's hidden very well). If you find it, you will know, that the dealer would like to have it.
Hopefully I didn't miss a question. You two have been really busy this night :o