Had 3-4 cones and the worst reaction. what do i do?

I was with a friend early yesterday and we were just mellowing out and watching a movie. We decided to get a little stoned as I hadn't done it for a while and was keen. Via bong I smoked about 3, almost 4, and my friend finished that one off as I had a vicious coughing fit. Since I hadn't smoked weed in quite a while, I was paying attention to my reaction to it, and I went on a downer. I wanted to sleep. I was seeing pretty well but I was constantly losing my train of thought and laughing at absolutely everything. I couldn't walk very well and everything felt surreal, like it all wasn't there, but I didn't mind. That was all fine. A couple hours later though, I started to lose control of what I was thinking, my thoughts became extremely negative and I had to stop talking because my voice would shake with a tone. When I got home later on, I was in the worst place, no motivation, extremely angsty, paranoid that my boyfriend was lying to me, paranoid that there was someone behind me. I was freaking about dying, but I felt very suicidal and confused as to why I was even there.
It's now the next morning and I had a shit sleep, and I still feel stuck in a rut, but a little more in control. If it helps at all, I do suffer from slight anxiety and paranoia is something I get a lot when I'm sober.