Okay... your son is NORMAL.
You cannot nit pick and read into everything and thinks its abnormal. Every baby is different... and to me (I have 2 kids), your son seems very usual and normal. He is developing just fine.
I think, you are over worrying...
The book "What to expect the first year" is real good. You can find it anywhere.
The way you describe your son, is not "symptoms" of something... but a description of "behaviors" that are age appropriate.
You need to keep "expectations" age-appropriate... otherwise you will worry yourself silly. And get stressed unnecessarily.
Screaming and "yelling" is COMMON for a mere baby... when they are happy AND they DO FLAP their arms and limbs... when they are happy. Their motor skills are emerging and their ability to move their arms in different ways. This & flapping is VERY common. BOTH my kids did that too, as well as all the other babies I know and known. This is not "weird" behavior. It is BABY behavior. And they cannot talk yet, much less respond correctly to their name... nor know as much as a 2 year old.
And babies crawl and sit up at varying times. There is a spectrum, or a range of time... where a baby does certain things. It is not by a single age only. If it were, all babies in the whole world would be doing things all at the same time. And they simply do not.
Do not just rush to "diagnose" for every little thing, or label him already. Or he will grow up thinking that EVERYTHING he does is "wrong" or retarded, or delayed or inappropriate or "weird".... and this alone, will affect him and give him hang-ups. So don't displace too much "anxiety" onto him... or he will grow up too OVERLY worried or neurotic or anxiety filled, to say the least.
Next, babies at this age do not "talk." But, They make all kinds of sounds, yelling, screaming, high pitched screeching, babbling, etc. All normal. It is just them experimenting with their voice... not being naughty or annoying. It is NORMAL progression of sounds.
Your baby is real normal.
WHY are your "heartbroken"????? I really don't understand why you are so heartbroken and sad about your son???
He seems so normal to me. And a typical baby for his age. Really. Don't worry. Babies and kids... can really feel stress and worry from their parents.
All the best,
Susan