I'm sure that was a traumatic experience. To answer your questions:
(1) Whether they searched the boy's apartment or not and whether they lied about it is irrelevant to the legality of the search of your home and person. It is not illegal for the police to lie.
(2) If the search warrant was just to locate this other person, then they could not lawfully search your person or other places, such as drawers, where he could not fit. However, if the search warrant also included drugs, then they can search just about anywhere because drugs can be stored just about anywhere including on your person.
(3) Depending on the circumstances of them searching your purse it may have been legal. If you had your purse in or around your house when they executed a search warrant for drugs, then they could search your purse. If it was at the police station and they were arresting you, they can inventory your personal property. That's not technically a search. It's an inventory, but the practical effect is the same.
(4) It is very unlikely that they have tapped your phone or bugged your apartment. Those types of activities require special kinds of search warrant and 24/7 monitoring and are thus very rare and typically reserved for the investigation
of very large scale drug operations where other means have failed.
(5) Excessive force is, of course, not ok, but proving it can be difficult when it is your word against the police unless it was video recorded.
(6) If you are going to court today, I assume you have or may be charged with one or more crimes. If so, you will need a local attorney as soon as possible.