Hi sir , I have 16 years old , I started masturbating from I was 10 , every day , and twice a day and maybe a 3thd time , new I feel weak , my heart beats sometimes fast beats , and I have a little pain in my stomach  can ejaculate this time , cause any problem ? thank you very much
I do not see this as being an issue, however if the symptoms continue it may be. A temporary alteration in blood-flow due to ejaculation and masturbation may cause shunting and or altered blood-flow to your gut temporarily, causing the symptoms of pain you are describing. Nonetheless, this should be very temporary, and relieve within a few seconds to minutes. I suggest you HY Chat Doctor.  If symptoms worsen and or new symptoms progress please contact emergency services! I wish you the best.