I believe I’ve had that same experience two years ago. I started experiencing all sorts of weird emotional disturbances and that weird ball of energy in the stomach. All of that was caused by a period of anxiety I was experiencing at work. Long story short: I barely slept for like 3-4 months and I had the most difficult time coping with the stress and weird sensations in my body. It affected my mood and I started having very negative thought patterns. Everything balanced out eventually. Something that was so dreadful I though it might not end… ended. I have a suble form of PTSD from that but it’s not bothering me. That experience eventually led me to reorganize my psyche and plunge myself fully in the quest of consciousness (meditation, mindfulness, managing “negative” emotions ecc) so at the end I realised everything we go through is just an experience we learn from. Good or bad, we’re talking about the two sides of the same coin which are inseparable. Stay true to yourself, never lose hope and also imho very important: ENJOY your hobbies, what you truly love doing. It helped me a lot. Peace.