I'm a 44 yr old female with asthma and since I stopped smoking 6 ...

I'm a 44 yr old female with asthma and since I stopped smoking 6 months ago my asthma got worse and doctor put me on Singulair about 6 weeks ago and have noticed many things.I have a lump on the base of my neck about the size of a baseball it wasn't there before i started taking Singulair. Also I have had several melt downs over stupid stuff and will cry over the smallest thing. My anger is very explosive. My body hurts and my heart races. I feel weak and sometimes like i'm going to pass out. It really scares me to the point I think I'm going crazy. My family has said my attitude has really changed since I started taking this drug. I'm not taking anymore of his drug. Singulair needs to come with more warnings than what they have now or take it off the market.