Hi there ~
These symptoms that you describe are classical of panic attacks an are common part of anxiety
disorders. The medications you mention are helpful with anxiety disorders. Buspar
can help you long term and Xanax
can help you in the short run when you feel like things are shutting down and other such nihilistic thoughts. It may be the case that you need a change in your medications and selective serotonin reuptake inhibitors (SSRIs) are good medications that have proven efficacy in anxiety disorders. Consult your psychiatrist
to get started on these medications. Also trying self help with yoga
and breathing exercises may improve your anxiety.
Hope this helps. Take care.