Someone who thinks all the time might be referred to as a "deep thinker" or "overthinker." A deep thinker engages in profound contemplation and reflection, while an overthinker may dwell excessively on thoughts, leading to stress or anxiety. Both terms reflect a tendency to engage in a lot of mental activity.
That was a terrible question, because you call someone who thinks they are ill all the time a hypercondriac. So as in Jeopardy, "What do you call someone who is constantly under the impression that they are ill?" Answer: "What is an a hypercondriac?" That is correct!
A know-it-all!
God
Hypochondriac
bitter
a dickweed
A chatterbox LOL
impecunious
Someone who laughs all the time can be described as "jovial" or "jolly." They may also be referred to as a "laughing person" or simply as someone with a cheerful disposition. In a more informal context, you might call them a "laughaholic."
It depends if your crush knows you like him or if he thinks of you as just a friend or if he likes you too. If he knows you like him don't be annoying to him and call him all the time just occasionally. If he thinks of you as a friend just call from time to time maybe 1 time a week at most. If he likes you too, then let him call some too, other wise maybe 3 times a week.
A best friend or a soul mate!
Party animal or party doll