Apparently it's the fructose in onions that causes stomach gas. Try cooking onions in a little oil until they're soft before adding them to foods - that will partially break down the sugar. Or steam them first. Also, reduce the amount you eat. A little onion goes a long way in my experience. You can also try cooking onions with stomach gas-alleviating spices like ginger, cumin, cardamom, caraway, turmeric, fennel, asefoetida (hing). Asefoetida is extremely strong, just use a small pinch, and heat it first in oil to reduce bitterness. It also can be an onion substitute for people who can't do onions (like me). The Japanese sea vegetable kombu is also recommended for stomach gas - if you can figure out what to do with it.
Most pediatric patients with hydrocephalus are treated with ventriculoperitoneal (VP) shunt placement. However, shunt malfunction is common and is usually caused by mechanical failure. Shunt obstructions may be confirmed with radioisotope examination or with fluoroscopically guided injection of iodinated contrast material into the shunt reservoir.
Spontaneous leaks are most commonly at the level of the spine, particularly the thoracic spine and cervicothoracic junction. Sometimes they are unintentional consequences of an overdraining CSF shunt, placed for CSF hypertension. CSF leaks can also occur in the nose after trauma or surgery. CSF leaks may follow diagnostic or therapeutic lumbar puncture as well as spinal anesthesia and after an inadvertent puncture of the dura following epidural anesthesia or epidural steroid injections. In this case, the leak is at the site of the puncture.