I think the Cancer Moon is the part of the trinity that is causing the overwhelming emotions and insecurity. Also, the planets move all the time, creating what we call transits. Many of the major ones are in Capricorn right now, which opposes Cancer. So that means it may be rocky for you emotionally for a bit. But I like the Libra Sun here. Libra is an air sign, which allows you to look at issues in an objective manner. Both Cancer and Libra are what are called cardinal signs of leadership, and you like to be in control and to get your way. Libra is like the iron hand in the velvet glove, and Cancer doesn't go after what they want in a direct line. So is there an area of life important to you where you are particularly struggling? Since you have Sag rising, Sag is a happy go lucky fire sign which can give you positive energy to help pull you through a hard time. This puts Gemini on the 7th, or partnership house, so Cancer is in the 8th house. This rules the money of the partner, insurance, death. Did you recently lose someone close to you, or is there a problem with an inheritance? I wish I had the whole chart here.
Venus is entering Pisces now, January 13, 2020, and that's a trine aspect to Cancer. That should help to calm you down and will remain in Pisces for about 30 days. Libras are normally confident, so are Sag people. Try to get out of your own way and keep busy so you aren't dwelling on your feelings too much. You know how they say life is what's happening while we are doing other things. I hope it improves for you!