Me again:
feeling of mental emptiness
COCC, IGN, PULS, SEP, STANNUM, Gels, Olnd, Plat, Sulph, am-c, asar, calad, cann-i, germ, kali-c, mur-ac, sars, stry zing

delusion that he can't think
Chel, onos

feeling of internal emptiness
aur

feels as if loosing capacity to think
ars, ign