Well man, this is something different I think. The definition of ED (Erectile Dysfunction) is "The regular inability of a man to achieve an erection firm enough to take part in sexual intercourse". What you describe above "my penis to pull back to make it like a small cock and it will also make my scrotum sack to lift up that swell and I get a cold reaction to my glans when I go to the toilet or do in normal things like doing exercises, go out for run, play football, fix cars....etc." is an absolutely normal reacot of tyhe human body to any kind of stress. I get that as well- whenever you are exposed to a ceratin amount of stress (such as exercise (which includes football, jogging, and everything you've said above) or anything that requires you to use your strength (I guess fixing a car fits here perfectly)), the body needs to send blood to the muscles so the stress can be dealt with properly (the muscles function better the more blood they contain). The definition of ED is what I mentioned above and what you're experiencing (or at least what I've read) is just a normal thing I think. Now, there are other things that are possible as well- the reason why you have ED (if you do) might be due to the fact that your blood flow to the penis is poor (which would mean that your body can not send blood to the penis properly, which would lead to extreme levels of turtling during any kind of stress). Give us more information on your ED and everything.