Chippy looks very, very ill indeed. If he's been ill "for a couple of months now", why didn't you take him to the vet sooner?
I'm very glad you are taking him to the vet now. There's no way we can diagnose him online through photos, and we are not avian vets, but given his symptoms he could have liver disease or a long term infection, as Amelia said above.
Please be sure to update us on his condition after you've taken him to the vet.
Meanwhile, please review all the links and "stickies" on the forums to ensure you are up to date on the very best of budgie care practices.
If you have questions after doing so, please be sure to ask as we'd love to help!
Cheers and best wishes
and Princess Mallorn!
Thank you to Deb for her wonderful Faery magic
Please ensure you have Chippy seen by an Avian Vet.
Avian Vets have special training to determine the cause of symptoms resulting from illness or trauma.
This is important as "regular" vets will often overlook symptoms that are quickly obvious to an Avian Vet.
When you rely on anyone who has not had training in Avian diagnosis and care, you may be delaying effective treatment.
This can prolong suffering that may be avoidable.
The bird will often require a more intense, prolonged treatment with a poorer chance of full recovery than it would have if you seek prompt professional diagnosis and treatment at the first sign of illness.
Please take the time to read through the Site Guidelines, all of the How To Guides, the FAQs, the Budgie Articles and the stickies located at the top of each section of the forum.
Truly, the very BEST advice anyone can offer you is to take the time to read ALL of the stickies throughout the various Talk Budgie forums as well as the Budgie Articles we have posted.
These are great resources for Talk Budgie members and have a wealth of reliable information which will assist you to learn the best practices in caring for your budgies for their optimal health and well-being.
When you upload pictures as attachments directly from your computer, tablet or phone, the forum automatically defaults to landscape. Additionally, the picture appears as what we term a “thumbnail” attachment.
The long nails need to be cut. A bird can catch itself and get injured if the nails are too long. As for your other question, the vet is your best source for the answer. Also ask to watch as your bird has his nails cut. You need to know how to cut nails correctly, as it has to be done often and is not really worth a vet visit to get it done.