Drone1973,
Number one tip for mead making... Patience! It's usually best not to start fiddling with things like the Acid balance... unless you have the equipment to determine if you are in or out of the pH range to start. I agree with hedgehog that adding the plastic lemon probably wasn't a wise decision. If nothing else it's probably going to dominate the flavor of your mead.
My questions at this point mirror Oskaar's, Brewbear's and Lostnbronx.
Aerating the heck out of the mead is vital in the 1st 3 days. Too little oxygen and your yeast don't have the ability to reproduce in quantities needed to compete with wild yeasts and provide you with a healthy active fermentation.
Yeast Hydration is also vital, it is ALWAYS best to follow the manufactures instructions for yeast rehydration. If your must is too hot you'll kill the yeast when you pitch it. If you don't rehydrate your yeast first, pitching it directly in the must could destroy the yeast as it tries to rehydrate, depending on conditions.
Some of the treated city water now uses a type of Chlorine that can't be boiled or easily filtered out. Probably best to use bottled spring water if you're unsure of your water supply.
These tips may not save this batch, but hopefully it helps narrow down where your problems lay, and you can avoid some of these common mistakes in the future.
I do suggest to all new comers, invest in a Hydrometer at minimum and a pH meter if you can afford it... they will help you, and us, isolate where your problems lay. Rehydrate as per directions, with goferm if using dry yeasts (lalvin), aerate the heck out of your mead the 1st 3 days. Fermaid K and DAP, or other nutrients are always a good Idea for straight meads as Honey must is nutrient & nitrogen deficient. And remember Patience!!! It's going to take 6 months for your mead to be drinkable... wait for some sound advice if you run into problems, the more you tinker with it, the harder it becomes for us to help you isolate the source of your troubles.
(I'm not picking on you Drone, it's a common problem... it's called Newcomers Panic, I suffered a mild form of it myself.)
Wrathwilde