I've used Phenibut for anxiety and insomnia. I used it in combinationwith 5HTP, GABA,valerian and kava. It has a noticeable but small effect on me. In combination with certain herbs it also gave me these ringing, nauseous,dehydrated headaches in the morning. I really hate taking psych meds, and most of my life I've not used them. However recently I'm back on lorazepam, seroquel, and mirtazepine plus flexeril. That combo usually get me to sleep, although even with those meds I often still lie awake withanxiety-producing thoughs churning. I hope you find something that works for you - poor sleep makes it easier for me to get into sensory or mental overwhelm. I would normally take a single 250 mg capsule, you can get it in powder form and adjust the dose easier, but for me more than a single 250 mg dose makes me feel lousy the next morning.