After sprinting i feel soo bad?

not breathing properly, i have the same thing :)

you hold your breath inwards while running the 100m but when you're doing the 400m you probably breathe much better because its a longer race and your body has more time to adjust

Soups, juices, coffee, tea, soft drinks and, milk are food stuff products, so consuming these types of products is like eating.

Wait at least 2.5 hours after eating before training or racing, this will prevent the felling of nausea during and after practices and when performing in competitions. Best time to eat and drink is afterward.

Besides water, sport drinks are designed for use during strenuous physical activity. However, drinking too much of these items during practice or competition can make one feel sluggish.

Two days before a meet, do very light practices and increase the fluids and salt in your diet. The fluids and salt helps you stay hydrated and is an important element in conducting electrical impulses to your muscles for proficient performances.

Breathing is important. One breath for every right arm pump is a good way to keep oxygen cycling. Also, short sprinting is more heavily anaerobic than long sprinting. You probably push much harder in short sprints, while long sprinting requires more pacing.