Hello Friend, Good that you are seeking a help here. You may be worrying too much or overthinking about future and obviously it will cause fear, negative thoughts and anxiety.
So more than looking at medicine or side effects , first thing you need to do is analyze and identify the reason or root cause behind this emotions disturbance. Based on this assessment various treatment options can be suggested like few lifestyle routine changes, self therapies, excersise and if required medications.
Be positive. Consult a psychology expert first to do the complete assessment of your symptoms and concerns.
Next Steps
Feel free to reach out to me online through Practo app for further detailed evaluation and suitable recommendation that you can follow practically to overcome this problem. Be positive. You will be alright soon.