Whats "too much"? I mean, theres really no right or wrong amount. Why are you taking more? Why not just go to bed or relax and occupy yourself if you are hesitant about it? I get the feeling that you probably dont need more right now. that said 300ish mg of amphetamine is a fair bit and should have you geeked or quite uncomfortable. But it isnt something id consider unsafe, to a healthy individual with tolerance. Its very important to hydrate and nourish yourself especially when dabbling in high doses of uppers. (funny since this is when its most difficult especially if you are fairly new to stimulant ab(use))
Dont mistake this for judgement, as I use very large quantities of methamphetamine IV 3-5 days a week. Ive had days when I really just needed sleep and rest but I decided to instead do back to back to back 250mg shots. (this was a bad idea. i had a headache and was shaky for 18+ hours) The thing about amphetamine based drugs is that you can become very tolerant to them very quickly. The common response is to increase dose, which is actually the wrong one if tolerance is something you want to avoid. Typically a everyday user of doses that are well beyond the theraputic norm, will have down regulated their production of dopamine, and the binding sites will be in a sense "off" When this happens you need to replenish and nurture your brain but a tweakers got stuff to do! So we dose again, this time higher to reach a feeling which resembles the explosion of dopamine we love. But its just not possible.