Day 1. New Gym Membership

I am so sick and tired of the weight room here at the condo complex not working. Either the equipment is broken, or it is 95 F in there.
After yesterday's daily ritual of "Fix the nautilus and have a sauna while working out" I decided to move out the old workout set that has been sitting in the storage room.
Caroline decided that it was time for me to finally get a real gym membership on this very same day stating (and I agree) that our place is too small for it to have a weight room on site, and that I should find a gym to join.
She is overseas in the Philippines right now taking care of business and investing in land, so who am I to argue. I went and bought a gym membership. At $22 a month, what a deal! I was happy and drove home, ate and then went BACK to workout.

I had a plan:
Day 1 - Chest and shoulders.

My body had another plan:
Day 1 - Chest and NOTHING THE HELL ELSE BECAUSE ITS BEEN YEARS AND YOU ARE NOT IN THE SAME SHAPE NOW.

So I went in... My chest routine looks like this:
(all these with olympic bar - anyone care to tell me how much that weighs?)

Flat Bench:
10(reps)x70lb
9x70... now i should note that by this time, i feel like i've never even been in the gym before. I suck at this all over again, and I cant even do this set to completetion. So lower weight.
10x50 (to failure) There... that is better.

Decline Bench:
9x50
5x50 ... so like wow. This was way too heavy. Like i am afraid if dropping the weight too heavy.
9x30 ... this seems ok. maybe 10lb more?
7x40 (to failure)

Incline bench:
9x50
7x40
6x40 (to failure)

Flat Pec Flys with dumbbell (these i am usually good at since i went to a gym in mexico that had no barbells for a time):
10x20
10x25
10x25
8x25 (to failure)

Ok... so that was hard. Like, real hard. I started about 9:35pm and by the time i finished it was 10:20, meaning that this took up nearly the entire hour i thought my workout would take.
All these were done with 1 minute rest between sets.

But onto shoulders (or so I thought)

Military Press (with smith machine as I have a shoulder problem and didnt want to hurt myself)
8x50
4x50
...

And that was is. I could NOT do anymore. No matter what I tried my energy was zapped and I was finished for the day. I have never had this before. I want to note that I am doing each and every movement with the best form I can muster, and I sure felt sore afterwards.
But why is this hurting me so much?
It has been years since i did a proper dumbbell workout, and so i wonder if i had that good of a workout?

Scary stuff, but tomorrow is another day.