Hi welcome to HCM I have gone thru your query regarding vomiting and vertigo in a person post a concussion Dizziness ,nausea , headache , are other common symptom about PCS ,. Red eyes are not a normal symptom though , yet it is just a out come of your prevailing problems ,is not a cause of concern .Redness lie down will go automatically when you are free of principal symptoms . Meanwhile you 1. wash your eyes with cold water 2. lie down in a comfortable position , Take cotton pad dipped in cold water , squeeze extra water and apply on your eyes . It gives instant relief. repeat for 4-5 times . Resting will help prevent attacks . Lie down for a minute or two and close your eyes . This will allow more blood to flow to your brain. After lying down, sit up slowly and remain sitting for 1 to 2 minutes before slowly standing up. it is recommended that medications be avoided if possible . especially if they are not working .Side effects of medications may affect people suffering the consequences . Do not drive a motor vehicle, operate equipment, or climb on a ladder while you are dizzy. Do not lie flat on your back. Prop yourself up slightly to relieve the spinning sensation. Move slowly to avoid the risk of falling. Drink more fluids, especially water. Other fluids are also helpful, such as fruit juice . Lemon juice in a glass of water with salt and black pepper ,is a instant energizer and reliever of dizziness .. Avoid : Caffeine, tobacco, alcohol, and drugs that can affect your blood circulation Dehydration which can cause or increase lightheadedness, when you have an illness that causes diarrhea, vomiting, or a fever , constipation ,sleeplessness ,worry ,anger . Modifying your life style and food habits by including ,essential nutrients - fiber ,vitamins mineral and antioxidants in natural form , advised by your qualified dietitian and regular exercise, yoga , Pranayam -Deep Breathing and Meditation under trained guide , will help long lasting health . Before applying any therapy in your regime , first talk to your doctor. If problem persist consult your physician . Hope this helps solve your query Take care All the best.