Vomiting:

It is a symptom of many minor and major health problems.

Don’ts:
Feed water or any liquid during or immediately after vomiting in a conscious person and no feed in an unconscious state till he/she regains full consciousness.
 
Do’s:  
In conscious state casualty should be in a comfortable back rest position only.
Once the vomiting is stopped or less oral re-hydration solution, juices, hot drinks, etc can be started on the instructions of a doctor. 
Reassure the casualty and rush to the hospital

In an unconscious state

Keep the casualty in a straight lying position [Supine] with head tilt chin lift and neck to one side
Take care of airway to maintain good ventilation.
Put gludial airway in mouth. [if possible]
Loosen the clothing.
Watch for the breathing and circulation [pulse] and if needed A-B-C and C-P-R. i.e. Artificial respiration and External chest compression.
Rush to the hospital.

Loose Motions:

It is a symptom of diarrhea, dysentery or any other infection of a digestive system.
Chronic loose motion not responding to medicine is also a symptom of some dreaded diseases like HIV/AIDS.
Acute condition is sometimes due to psychosomatic disorder  for example phobia of examination, interview, any important event or occasion, this type of loose motion is called as IBS [Irritable Bowel Syndrome]

Don’ts:
Spicy, fried, fatty, hotel ling, non-vegetarian and junk food, home medication.
Do’s:
In no pain condition allow him to take light food with lots of  roughage.
Accompanied with the patient while going for toilet or moving around because due to weakness tendency to fall cannot be denied.  Try to collect stool for pathology test on the instructions of a doctor. Maintain hydration by feeding water and plenty of liquids in no pain condition only. If any obvious cause of loose motions is observed like food poisoning, drug, etc then please report to the doctor and also carry that item along with the patient for the quick and accurate treatment.