Were you sweating when you woke up with your problems during the night and, did these continue for some time ?
Regarding your constipation (and some of your other symptoms) checkout the info on Magnesium Deficiency:-
http://prettyill.com/videos/watch/the_magic_of_magnesium
http://prettyill.com/forums/viewthread/1802/#5269
http://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/
It really is an eye-opener. For some people there will be an initiating event such as a trauma, or a virus, or something similar that swells the brain but for other people, they cannot link any specific trigger to their symptoms, it just sort of crept up on them and this is where a progressive magnesium deficiency could be the initiating factor.