Jay, there may be a couple of problems with your current stack:
1. I assume you are consuming pramiracetam with fatty food, either that or stirring a few hundred mg in a 1/2 tablespoon of olive oil and then drink this with water to wash it down (not as bad as it sounds). Otherwise, you will have very little to no effect from pramiracetam, as pramiracetam is fat-soluble. I think pramiracetam is a good choice, I have had good results with it.
2. The current choline source you are using may be an issue. A lack of choline is most likely why you are getting that headache feeling. Choline bartartrate does the job, but only if you take a couple grams of it (much of it does not cross the blood-brain barrier until you take large doses). You do not seem to be taking enough choline bartartate. Also, I would never recommend taking any type of racetam without a choline source, as the resulting headache you will most likely get will be annoying and decrease the benefit of taking the racetam in the first place. I would even say that using a higher power racetam (such as pramiracetam) with bartartrate may not cut it. piracetam is fine with bartartrate in my experiences, but I usually get a headache if I use bartartrate with pramiracetam. Not all choline sources are created equal.
Personally, I would ditch the DMAE and Huperzine A, and just use 250-300 mg of either alpha GPC or CDP choline ("citicoline"). Huperzine A with either centrophenoxine or DMAE is just not as good (in my experience) as simply taking 250-300 mg of either alpha GPC or CDP choline ("citicoline") to supply the much needed choline when taking nootropics. Using a good choline source should get rid of the pressure headache feeling. Things like choline bartartrate, choline citrate, and lecithin may get the job done, but I would not recommend using either of these three exclusively with racetams. Once you taste the good stuff (alpha GPC or CDP choline, which can provide nootropic effects even when taken alone) - there is no going back.
If you are already doing these two things already, then I am not sure why you are getting headaches.
For enhancing memory, some other supplements you can investigate (although your memory will certainly be enhanced by taking a good choline source with your pramiracetam): Lion's Mane, Bacopa, and vinpocetine. I have not used either of these three myself, but all of them are frequently mentioned as "memory enhancers" and a lot of people take them along with nootropic stacks. But you will most likely have to take lion's mane and bacopa for several weeks at least to get desired results.
Edited by timjeezy, 02 September 2012 - 09:05 PM.