Hi, I am a 28 year old male diagnosed with "accute sinusitis"...

Hi, I am a 28 year old male diagnosed with "accute sinusitis" and "seasonal" allergies. My ENT put me on Singulair after numerous attempts at other drugs, including, Allegra D, Allegra 180, Clarinex, and Zyrtec. I have mild nerves and anxiety as it is but since I have been on Singulair, I have been fatigued, weak, nautious, no appetite, depressed, more anxious, more nervous , tingling in my face and skin and tightness in my chest. I am freaking out thinking I am dying of stomach cancer or heart disease and I can barely function. These symptoms/side effects started 4 days after starting Singulair. Someone out there please tell me I am normal and that if I stop taking this I will feel better because I cannot go on like this much longer. It is helping my allergies and my ears but I'd rather live with stuffy ears and nose compared to the side effects.