Why isn't my penis getting hard after daily blowjobs?

I think you might have premature ejaculation. This means coming quickly when you’re touched sexually. It’s common and can be because of stress, nervousness, or inexperience. Try to be relaxed about it and talk to your partner. 

These signs might be because of many things such as stress or bad eating habits. But don’t worry, your brother’s test result was negative which is good news but to ease your mind, you should also take an HIV test among others after discussing with a doctor about the issues at hand. 

This can happen because of the sudden increase in blood pressure, muscle tension, or changes in hormones during the activity. To help lessen these headaches, you might try taking it slower, using techniques to relax, or turning your body to a different position. If the headaches still annoy you, it's a good idea to talk about this with a doctor.

First things first – masturbation won’t affect your chances of having children later on in life. It’s normal and won’t hurt your fertility at all. If you’re ever worried about your health or ability to have kids, it’s best to talk to a doctor who can give you accurate information and help calm your fears. 

The redness on the head of your penis can be the result of irritation or a mild infection. It may be beneficial to visit a dermatologist to get a more concrete picture. These people can do a physical examination and may even recommend other tests. Wash the area frequently and stay away from strong soaps or lotions that may further irritate it.