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Hello. Thanks for the question.
The occasional vomiting can be due to gastric reflux or IBD (inflammatory bowel disease). The coughing is more worrisome. Coughing up brown fluid is often a sign of pneumonia or bronchitis or cancer in the lungs. I would get some chest x-rays to make sure the lungs are clear.
If the problem of occasional nausea has been going on a while, you could try adding an antacid in the evenings or morning or both. I usually go with Famotidine (Pepcid). You can give 20 mg 1-2 times daily.
If the antacid doesn't help and the lungs are clear, I would get intestinal biopsies to rule out IBD. From there, dietary management with a hypoallergenic diet and often times immuno-suppressant steroids can help with the signs.
I hope this helps, let me know if you have any other questions.
That bloodwork looks pretty normal.
I would wonder if that vomiting is from one of a few things:
GI tumor (less likely given the time frame)
I really think I would start with a hypoallergenic diet and Pepcid daily. A diet of Hill's Z/D or Purina HA are the two more common hypoallergenic diets. If that doesn't resolve the signs over 2-4 months, then I would do biopsies/ scoping of the gut at that time.
If there is heart enlargement, that in itself can lead to coughing as the heart presses on the smaller bronchi of the lungs.
That vomitus looks like fluid with some digested blood in it giving it that dark look.
I recommend x-rays of the chest every 6-12 months to monitor for size enlargement that is worsening. Once clinical and having respiratory signs, I send them to a cardiologist for an Echo (ultrasound of the heart). That gives us a better idea of the heart function and a prognosis going forward.