L-Arginine increases Nitric Oxide (NO) to your penis, which is essential for healthy erections. NO is also important for the proper functioning of your penis smooth muscle, which is essentially how your erections work.
BTW, I absolutely believe you should still take a break. 1 week at the least, although I suggest 2 weeks. Are you sure the anxiety was causing your erections to go away? If your PEing properly, and healthfully, your erections should be strong and hard. Since you needed the Lavitra, my bet is that your penis still needs some rest. Give it what it needs
