I have had and sometimes still do have the same problem. I think this is a condition where you have to find out what works for you. For me it’s a routine. I’m on a mostly plant based diet except for an egg twice a week and fish a few times a week. My morning routine is 5 prunes followed by a big cup of Sencha green tea. Most times it works within half an hour, usually after I started a workout. Other times it’s effective after the workout breakfast and a cup of coffee. That’s what works for me. Good luck.