That depends on the university. If you want to tell me which university, I can tell you which standard the security personnel are held to.
If you mean, did they have a right to check a person they detained for weapons? Then, the answer would almost certainly be, yes. If they are private individuals, the same 4th Amendment protections do not apply to them, and if they are sworn officers they can do so with minimal justification. Diving into pockets and other items you have in your possession (purses, handbags, etc.) may be a different story. But, again, if they are PRIVATE security, then the same rules for protections from the 4th Amendment will not apply. And even an officer will at the very least separate you from your bag. And, if you are suspected of theft, a sworn officer searching your pockets may be justified even by on officer under the circumstances.
That's sad, but how much damage has this caused you? What are you therapy bills? How many classes have you dropped out of because you are afraid to set foot on campus and how much did those missed classes cost you? Simply saying that your school experience is ruined is hardly enough to justify a claim against the school. And, if they had reasonable suspicion for the detention and probable cause for the search (both of which are likely) then any claim you have is going out the door.
If you believe you have a legitimate claim, run it past some attorneys. If they do cartwheels and start planning their next trip to Hawaii and agree to take the matter on contingency, you have a winner. If they nod politely, say you have a good case, and ask for $20,000 or more up front, walk away.