I suffer from hypochondria and i've noticed that i begin to feel better around 6pm-7pm. it's almost like i'm carefree and thinking "rationally". but throughout the day i'm depressed and scared. why?

Need evaluation: To answer this question, you would need a full evaluation with a psychiatrist or psychologist. This would provide space and time to share your story and what you're experiencing. Some investigation like that might help clarify what's happening with you. From what you've said so far, only guessing is possible -- and you deserve more. Best wishes.

Diurnal variation: Depression and anxiety can fluctuate within a given individual throughout the day. This is called diurnal or twice daily variation and is likely linked to our chronobiological clocks (the internal system in our bodies that regulate our bodily functions throughout a 24 hour period, the circadian rhythm). It is actually quite common until your condition comes under control. Best wishes.

Solve your mystery: In talk therapy, you may be able to discover the answers to your questions. Only you hold the information needed. As you explore in a methodical manner the elements of the daily activities and interactions you might find clues or clear signs of why this is true for you. It may have a lot in common with an old fashioned mystery tale. You can be sherlock if you find a good dr. Watson.