Hello,
Since you are having heartburn associated with vomiting once since yesterday, you should take PPIs for relieve. Antacids are also effective. Take digestives (Syp Aristozyme) & liver tonics to boost your system.
It looks like you are stressed up. Lethargy often occurs due to overexertion, overworking, lack of exercise You need adequate rest & sleep. Take a break from work if possible. Stay well hydrated & avoid stress and anxiety.
Medical conditions that cause lethargy are
hypothyroidism,
hyperthyroidism,
dehydration, fever, CO poisoning,
sleep apnea, heat disease, stroke, depression, etc.
Lethargy is treated by reducing stress. Anti anxiety or
anti depressant can be prescribes after clinical examination. Regular exercises, plenty of water & sleep will reduce lethargy.
Get blood tests done to find the factor causing lethargy, you will be treated accordingly. Take vitamin supplements & healthy home made food.
Hope I have answered your query. Let me know if I can assist you further.
Take care
Regards,
Dr. Nupur K