Anxiety Attack or just a breakdown

Or maybe just a breakdown. I cant make the difference anymore. I did a guided meditation before leaving bed. I took my dog out for a walk and during the walk I just started breathing heavy and overthinking about things happened during Christmas. As I was riding the elevator up to my place and I was alone I had a full breakdown crying and couldnt breathe. I immediately put a guided meditation to relieve the attack. After few deep breaths I calmed down and stopped crying but I cant stop shaking and I dont know how to deal with this. It happened 3 times in January.
I am so desperate and I feel so helpless.