Not being notified by my Apple Watch

After I turn on the Silent Mode on my iPhone in order not to be disturbed by its sounds, I relay on my Watch to notify me of any incoming informations. But more often than not, my watch doesn't notify me at all. It shows the notification as a red dot when I look at the screen but I doesn't vibrate. It was the cause of a lot of inconvenience for me because it made me miss some important messages and calls. The very reason I bought the Apple Watch for is not working for me now. I want haptic feedback to notify me of anything happening on my iPhone without having to be disturbed by sounds on having to disturb my surroundings with sound notifications. The same issue made me miss my alarm once. I was wearing my watch while sleeping, counting on haptic feedback to wake me up but nothing happened at all. Yet another example is not receiving feedback from Maps, not being notified when to make a turn or take an exit. Please, help me set up my gadgets to fit my needs. Thank you!