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Doxycycline and long term nausea

While taking doxycycline for suspected Lyme disease (which I did not have),  I developed a number of sensitivities that have not abated totally after 3 years. While taking the drug I became nauseated and  would retch violently. These symptoms have diminished but still occur.

Initially I would begin retching when I first woke up and at dinner times. If I got hungry and began to have hunger pains,I would start to retch.
I also discovered that oatmeal seems to exacerbate the problem. When I cut out oatmeal my symptoms decreased dramatically.
Huge doses of omeprazole seemed to have had minimal effect and I think made my symptoms worse.
I’ve had a flurry of tests. None have indicated a specific reason for the continuation of symptoms.
I do have acid reflux but never vomited and ate oatmeal almost every day. After taking antibiotics,  I went from vomiting once or twice a decade to extreme retching a few times a week. It’s quite awful.  
I have seen a gastroenterologist. Had lots of scans and lots of blood tests. Dr says not related to antibiotic use. Just coincidence that symptoms began at same time.
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15695260 tn?1549593113
Hello and welcome to the forum. This is indeed perplexing.  You did not have anything at all revealed during examination and testing?  That's frustrating.  Could this be an issue since oatmeal is a trigger of too much fiber? Something else to look into is carbohydrate intolerance.  https://www.merckmanuals.com/professional/gastrointestinal-disorders/malabsorption-syndromes/carbohydrate-intolerance.  However, that would most likely would only be the situation if you have a long standing history since childhood of gi issues. People also can develop an oat allergy as an adult.  https://www.healthline.com/health/oat-allergy
As to your question if your usage of Doxycycline would result in a long standing post usage side effect, that is unlikely but not impossible.  Anything is possible. In the mean time, discontinuing triggers would make sense such as no more oatmeal.  I'm sorry I don't have better information for you but this is a very unique situation that I hope you get answers for.
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Avatar universal
Finally saw an allergist who thought my  sensitivity to oatmeal was rare but has been seen in children.  I only discovered the link by accident since oatmeal is prescribed so frequently as the go to food when you’re nauseated. She also believed that antibiotics could affect the permeability of stomach linings. ( I’m not sure I’m explaining this part accurately) She did not think my linking nausea with antibiotics as so far fetched.  In any event, more than a year since the nausea and violent retching has ceased which coincidentally corresponded to my cutting out my favorite food .
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Avatar universal
Thanks for responding. I’m hoping that it’s diet related and the  gastroenterologist set up an appt with an allergist.  However, while my symptoms do seem related to what I’ve eaten there might be a neurological component which fit  my symptoms. Morning nausea is sometimes an unusual side effect due to positional changes and pressure changes in your brain. My dinner time hunger and nausea which is always how I’ve characterized it is also right after I exercise. I don’t know if pressure related.  My nausea occurred one time atypically when I was in a car driving up a mountain. So the most depressing possibility is that I have a brain tumor and the nausea is related to pressure changes in my brain.  
I know entirely bizarre and after a year of looking up symptoms, the pressure changes are a sobering explanation.  Im not in a rush to find out but will schedule additional tests and hope for the best.  Thanks again.
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