Medication that contains alcohol

Q: Today many medicines/sedatives/pain killers whether allopathic and homoeopathic contain certain percentages of alcohol in them. Operations are also performed using anaesthesia. Hence, we are left with no choice but to use them for our well being. What is the Shariah ruling seeking cure using these alcohol based medicines? Are they Halaal or Haraam?  Please give details.

Semen

Q: I read online that semen is pure so since semen is taahir if we get wet dreams and semen gets into our clothes and body we don't need to wash it. Do you agree?

Health benefits from the side of the employer

Q: Is it permissible for Muslims to use the health benefits offered by the employer via an insurance company?  The employees fill the forms of the insurance company and send them to the health department. Nothing extra (regarding health insurance) is deducted from my salary. My salary, as per contract, is fully provided to me. Is it permissible for me to use these health insurance benefits?

Tawbah

Q: I did something bad and have made sincere tawbah. As of right now, I have not repeated it. I was wondering if there is anything I can do (dua' or action or anything else...) to make Allah conceal this mistake so as to protect me from the embarrassment and humiliation of it being exposed? Please give me sincere advice and make dua' for me.