Are blood tests for allergy/IgE levels to foods considered reliable? Paranoid over certain foods and want to put fears to rest and liberalize my diet.

False positives. If the result of either the Allergy skin test or specific IgE test is negative then it's very reliable. Positive results on the other hand are only accurate 40-60% of the time so would need to be matched with specific allergy symptoms upon eating the food in question. Screening for a bunch of foods without a thorough history is therefore frowned upon. Testing for Celiac somewhat different.