Feeling numb all over chest tighten up hard to breathe and crying for no reason is that a panic attack?

Most likely panic. This sounds like a typical panic attack. Since you had cardiac symptoms it would be a good idea to see your doc. Perhaps an adjustment of you Effexor (venlafaxine) is in order as well. Best wishes.
Maybe. It does sound like a panic attak, but is there something occurring in your life that is very stressful? Whether there is or isn't, see a physician for he/she can help you, either way!