I could have written your post. My symptoms were so physical that I went undiagnosed for a year and written off as a hypochondriac. When I was finally put on meds I was on 10mg of Lexapro (which worked great for me) and .5mg of Ativan (an anti-anxiety med) as needed. I have been told by my psychiatrist, and a pediatrician that both were fine to take while nursing, but the Ativan shouldn't be a daily thing, just for use occasionally when the anxiety gets out of control.
What you are describing to me doesn't exactly sound like a panic or anxiety attack. For me, those were much different. They felt like I was going to die right then and there. My heart would race and pound, I would get suddenly nauseaus, I would get hot and suddenly very weak. My head would feel tingly and things would start to get sort of fuzzy or gray. I had a tremendous need to "escape" from wherever I was.
What was more common for me was to have little aches and pains. Things like heart palpitations, tingly fingers or toes, little twinges in my shoulders, arms, legs, etc, muscle aches, a nervous stomach. What went along with these were the constant worry that perhaps I was really having a heart attack and was going to die. It became nearly impossible for me to stop those thoughts. I would be out with friends at the playground, and I might seem perfectly fine to them, holding a conversation, but in the back of my brain there was another conversation going on with myself. I would be thinking about who would have enough room in their van to take my kids with her if I had a heart attack and had to go to the hospital. I would wonder how they would get the carseats from my van to theirs. I would make my dh wake me up before he went to work in the mornings (he goes in at around 5:00am) to make sure I was alive so that the boys wouldn't wake up and find me dead. Looking back, they were such irrational thoughts, but as much as I tried, I couldn't control them.
I didn't get the right help until I was under the care of a psychiatrist who could find the right meds to help me. All meds work differently for everyone, and what may work great for one person, may not do the same for you.
Best of luck, and keep us posted on how you're doing.