Hi Kina; welcome to Anxiety Zone...
It's really a shame that so often it's only those that suffer with chronic anxiety/panic attacks/depression, that can understand these disorders. If someone says they have cancer, diabetes, heart disease, or even a broken leg, it seems like everyone can understand that.
The bottom line is that chronic anxiety/panic attacks/depression is not a "mental illness", but in reality is also a physical one, with physical components.
I am glad to hear that your physician has started you back on an anti-depressant. With the history you have provided, you should give some deep consideration to perhaps remaining on your BuSpar and Lexapro indefinitely, meaning the rest of your life. I plan on being on an anti-depressant, for the rest of mine.
You are among friends here on Anxiety Zone. Keep us up to date on how you are doing.
The very best to you, Kina!... Chuck