I would think It constantly trying to get an erection is a great indicator of positive EQ? Same with it physically being larger, I.E. fuller and holding more blood naturally, same with tingles. Tingling is not bad in of itself, could be from putting pressure on an area youve rarely touched before, if the tingle is actually painful then that can be a cause for concern. The only truly concerning thing is the ‘green veins’? Do you mean green as in it looks bruised? Or do they appear green because they are actually blue and along with your skin color they appear green?
If its literally just the veins that are green, i would think that its actually just blue… unless your an alien with green blood of course. And perhaps your developing new veins due to the increased exercise.
HOWEVER, if the green is not just the veins themselves but the skin around the veins than it sounds like you have been a bit to rough and bruised yourself while jelqing. If thats the case you should absolutely take some time of heal, and be sure to use a much calmer grip once your healed up.
If its not a bruise you are probably okay. I would just say if your feeling pain, either try to start using a lighter grip, lower the repetitions or include an extra rest day. Most of the other things you mentioned dont sound like issues in of themselves but pain is and should always be treated as…..pain. PE does not have the ‘no pain no gains’ philosophy.
And always always always…. listen to your body. No one can tell you if what you are feeling is pain, or tickles. Or if you have a bruise or if you got some dirt on your wang. You an adult human in your own body knows whats good and bad. Pain bad. Bruises bad. Erections good. And so on. Dont overthink ever little reaction and change, just be diligent, aware and use some common sense when it comes to how your feeling.