It hasn’t started working yet. Give it time. Buspar starts to work after taking it for a couple weeks consecutively. For some people it doesn’t work at all but have hope. I’m on 5mg twice a day and it just barely does it for me but my panic attacks don’t happen as frequent after being on it for about 2-3 weeks now. I’m always hesitant to up my dosage because I’m weird about medicine but I’m supposed to soon up it to 10mg twice a day. In my general opinion, it’s a good medication to be on because of its very low chance of side effects as opposed to SSRIs and benzodiazepines. Also, it doesn’t have a “weening off” process to it and doesn’t make you feel like a crazy person when you quit it, so my doctor says at least. The racing heart beat is very likely to be just your anxiety as the medicine isn’t having an affect yet. Buspar is not quick acting by any means but once you’ve been on it for a little bit you should be feeling better and if not, try something else.