The effect it had on you sounds real and also fits with some of its know pharmacological actions.

http://www.ncbi.nlm.nih.gov/pubmed/17509559

I also know that astargulus is considered as traditional Chinese treatment of myasthenia. But, only in certain sub-groups of patients. ( I have no understanding of chinese medicine so don't know how this choice is made, other than what is written in the integrative medical literature-Pi deficiency, which is chinese to me).

I do not know how safe it is (short or long term). The meticulous studies and safety parameters that apply to medications in the western world are not, to the best of my knowledge, required for Chinese herbal preparations.

I know that there are some on-going early phase studies of this herb in cancer patients, which suggest that it is safe, but there is not enough conclusive data yet.

I would regard it as any other form of experimental treatment.