Hi @Robert_Gebczynski, I'm sorry to hear you've had a bad experience like that. Of course, headaches and stomach aches have many possible causes, but whenever they happen after you've introduced something new into your diet, that likely seems to be the cause.
The best advice I can give you is to start slowly like @n3ziniuka5 points out. Your body has been processing the same foods for years and years, to which your gut microbiome has adapted. Your body has never processed Jake before. Have a Jake in a couple of days and see how you feel. Then gradually build up if you're feeling good.
Another tip is to drink plenty of water. Although having Jake feels like drinking, it really is a meal. Take some time and make sure you drink enough water on the side. Dehydration is one of the major causes of headache.
Lastly, do you have any food allergies or intolerances that you're aware of?