Hi, thank you for using health care magic.
I can understand your concern.
I am not aware of aryuvedic medicine but i can suggest some other methods for curing early ejaculation. 
Use condom having gel which can reduce excessive sensation from top of the penis(
glans penis). 
There are techniques called start -stop technique , and squeeze technique which can offer you more control over ejaculation. This will delay ejaculation over time. This techniques works by changing the conditional reflex of early ejaculation.
Medicine like sertraline , escitalopram,peroxatine, 
clomipramine are also helpful in delaying ejaculation , this medicines are usally prescribed by psychiatrist for treatment of depression but for your condition they are also useful.
Erect and hard penis is enough for sexual activity so do not worry about , as this will increase your anxiety about performance in sexual activity.
Doing regular 
masturbation and getting excited is quite normal in male, and in my opinion it should not bother you. 
I would suggest you to 
consult psychiatrist for further help if needed. Psychiatrist can also help you out through 
behavioral therapy in your condition. 
I hope this will help you.
Regards.