Sorry you are having such a bad time. I have never taken paxil myself but I am currently taking effexor. You will need to give the increased doage time to work. Sometimes when you start an antidepressant, your symptoms can increase slightly. I know I had increased anxiety when I started my med but it went away after a couple of weeks.
If you really feel like this med is not working for you, there are plenty of others you can try. If you switch from paxil to effexor, you will need to wean off the paxil first as it is not recommended to stop an antidepressant cold turkey. I had to have 3 days break between swtiching meds and then I started my new one.
Your doctor will talk you through what to do and how to wean off the paxil and start a new med. When you see your doc, write down a list of questions before your appt so that you don't forget what you want to say and ask.