is my rainbow lorikeet sick

[xxhannahgreenxx]

I recently rescued a baby rainbow lorikeet, his feathers are fully grown apart from under wings and his eyes and beak are just starting to go brighter, but because I have been owning cockatiels for 1year m not sure what to watch out for in him, I know their poops are different but some days dinos pops will look similar then a few seconds later his poop will change to water (he willsittheir and make this squeaking noise when he sprays water/poop) then they go to this orange/brown liquid and also a orange Brown sortof solid At the moment its stayed at the water for quite a while now . The other thing I was woried about was he is sneezing abit and making this cry all the time if I take him off me and he looks so scared all he wants to do is sit on my bun and squirt water out its so gross and I don't know what is wrong or if its normal so please help me on the health basics with rainbow lorikeets, I'm scared he is sick, I will try anything to help him
Thank you