About the dryness, tightness in throat. can it be just not enough saliva?

Yes.: This is a nonspecific finding that may occur during some activity. It may be because of too little fluids, or it may be due to a chemical called Atropine which produces, among other things, dry mouth. It could be an asthma attack, or panic disorder. It would be a good idea to see your doctor if it occurs regularly in order to be sure what it is.