Claritin, (loratadine) marijuana, and azithromycin. Any interactions between those 3?

Check it out. You can use interaction checker for questions about drug interactions with herbal or natural medications. NaturalDatabase.com is 1 example: http://naturaldatabase.therapeuticresearch.com/nd/search.aspx?s=nd&pt=7.
Maybe. The claritin, (loratadine) Azithromycin & mj do not adversely interact. However, mj & Azithromycin may affect the cardiac rhythm. Please consider discontinuation of mj since it may have deleterious long term consequences.

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Azithromycin, Claritin (loratadine) d, and Advil cold and sinus- is it dangerous to take all these at once?

Decongestant. I don't know what are in Advil cold but suspect that it contains a decongestant such as pseudoephedrine. If you take this along with Claritin (loratadine) D, you may get OD from the decongestant part leading to insomnia, rise in pulse or BP, anxiety etc. Otherwise no problem. Read more...