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Hello. Thanks for the question.
It sounds like you're seeing signs of an upper respiratory infection, most notably laryngitis. This can lead to difficulty swallowing, gagging and an abnormal sound to the meow.
Most of these are viral, so they will resolve on their own over 5-7 days. I'll often times use an anti-inflammatory medication (Metacam or Onsior) and an antibiotic to get them to clear up faster.
If she is not wanting to eat her food, then I would try a canned diet warmed up in the microwave. If she's unable to get it down, then I would get her seen right away to make sure there's not an obstruction in her esophagus- this would be pretty rare.
I hope this helps, let me know if you have any other questions.
You would give 0.2 mg. If it's 1.5 mg/mL, that would be 0.13 mL.