You have just recovered from an illness and your hair loss is linked to that. This type of temporary hair loss is called Telogen Effluvium (TE) and is nothing to worry about. Your hair will grow back, naturally, within 4-6 months, but the hair follicles can also be stimulated into growing faster by eating right and applying topical solutions that promote hair growth.
Soak around 50 grams of black cumin seeds in 2 cups of coconut oil, and let it stand for 6-8 hours. This makes it easier to draw out the properties of the seed. Next heat the seeds and the oil, on a low flame, until the oil begins to smoke, cool, strain and apply on hair, leave overnight, and shampoo the next morning. Do this at least twice a week.
You can also use other commonly available ingredients to promote hair growth, such as fenugreek seeds (methi seeds), hibiscus flowers and leaves (jabakusum), curry leaves (curry patta/meethi neem) and nigella satvia (kalonji). Cook these in coconut oil as explained above and use as advised above.
Another home remedy that restores hair is the use of onion juice. Grate or grind an onion, squeeze its juice and apply on the scalp. You can leave it overnight and this treatment can be used as often as desired. To avoid the eyes burning, discard the white part near its stem.
Include the following foods in your diet –
1. Pomegranate – it contains punicic acid that helps with hair growth. Punicic acid can also be found in snake gourd. Have one pomegranate a day
2. Munakka – these are like raisins (dried grapes), but have a seed inside. Take 4 of this every day
3. Almonds – 4 a day
4. Eggs – 2 a day
5. Fig – 1 dried ring a day
7. Biotin supplement 10mg capsules twice a day, after advice from a doctor
8. Multi-vitamin and mineral supplement, after doctors' advice
This diet will provide you with the right nutrition that will control hair loss and promote regrowth.
The above is based on personal consultation with a dermatologist. I would advise you to visit a dermatologist who can assess the condition and suggest treatment accordingly. There are topical treatments available too, such as Racine Hair Lotion and Juene Hair Oil and crème and La-Matisse hair serum and shampoo.